From 6ac804e994301eea0274796b291720b192df5c3c Mon Sep 17 00:00:00 2001
From: Abdur Rahman <90972063+Abdurrahman-shaikh@users.noreply.github.com>
Date: Sun, 23 Feb 2025 04:38:07 +0530
Subject: [PATCH] Feature/convert to grayscale (#3003)
# Description of Changes
Please provide a summary of the changes, including:
- What was changed
-Grayscale Image Compression:
Modified the compressImagesInPDF method to optionally convert images to
grayscale during compression. This is
achieved by checking if the grayScale flag is true (or if the image is
already in grayscale) and then processing the image
accordingly.
UI Update:
Updated the compress-pdf.html file by adding a checkbox for grayscale
compression. Additionally, a new translation
key compress.grayscale.label with the text "Apply Grayscale for
Compression" has been added across all supported
languages.
- Why the change was made
-Enhanced Compression Options:
This feature provides users with an option to compress images in PDFs
more effectively by reducing the color complexity, which can lead to
smaller file sizes.
Improved Flexibility:
It allows users to decide whether they want to maintain the original
color images or opt for a grayscale version.
- Any challenges encountered
- The translation for compress.grayscale.label was generated using an
automated translator, so it might not be completely accurate and could
require further review.
Closes #2603
---
## Checklist
### General
- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)
### UI Changes (if applicable)
- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)
### Testing (if applicable)
- [x] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.
---
.../api/misc/CompressController.java | 29 ++++++++++++++-----
.../model/api/misc/OptimizePdfRequest.java | 9 ++++++
src/main/resources/messages_ar_AR.properties | 1 +
src/main/resources/messages_az_AZ.properties | 1 +
src/main/resources/messages_bg_BG.properties | 1 +
src/main/resources/messages_ca_CA.properties | 1 +
src/main/resources/messages_cs_CZ.properties | 1 +
src/main/resources/messages_da_DK.properties | 1 +
src/main/resources/messages_de_DE.properties | 1 +
src/main/resources/messages_el_GR.properties | 1 +
src/main/resources/messages_en_GB.properties | 1 +
src/main/resources/messages_en_US.properties | 1 +
src/main/resources/messages_es_ES.properties | 1 +
src/main/resources/messages_eu_ES.properties | 1 +
src/main/resources/messages_fa_IR.properties | 1 +
src/main/resources/messages_fr_FR.properties | 1 +
src/main/resources/messages_ga_IE.properties | 1 +
src/main/resources/messages_hi_IN.properties | 1 +
src/main/resources/messages_hr_HR.properties | 1 +
src/main/resources/messages_hu_HU.properties | 1 +
src/main/resources/messages_id_ID.properties | 1 +
src/main/resources/messages_it_IT.properties | 1 +
src/main/resources/messages_ja_JP.properties | 1 +
src/main/resources/messages_ko_KR.properties | 1 +
src/main/resources/messages_nl_NL.properties | 1 +
src/main/resources/messages_no_NB.properties | 1 +
src/main/resources/messages_pl_PL.properties | 1 +
src/main/resources/messages_pt_BR.properties | 1 +
src/main/resources/messages_pt_PT.properties | 1 +
src/main/resources/messages_ro_RO.properties | 1 +
src/main/resources/messages_ru_RU.properties | 1 +
src/main/resources/messages_sk_SK.properties | 1 +
src/main/resources/messages_sl_SI.properties | 1 +
.../resources/messages_sr_LATN_RS.properties | 1 +
src/main/resources/messages_sv_SE.properties | 1 +
src/main/resources/messages_th_TH.properties | 1 +
src/main/resources/messages_tr_TR.properties | 1 +
src/main/resources/messages_uk_UA.properties | 1 +
src/main/resources/messages_vi_VN.properties | 1 +
src/main/resources/messages_zh_BO.properties | 1 +
src/main/resources/messages_zh_CN.properties | 1 +
src/main/resources/messages_zh_TW.properties | 1 +
.../templates/misc/compress-pdf.html | 7 +++++
43 files changed, 78 insertions(+), 7 deletions(-)
diff --git a/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java b/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java
index beff8261b..328c8beb5 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java
@@ -31,6 +31,7 @@ import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.extern.slf4j.Slf4j;
+
import stirling.software.SPDF.model.api.misc.OptimizePdfRequest;
import stirling.software.SPDF.service.CustomPDDocumentFactory;
import stirling.software.SPDF.utils.GeneralUtils;
@@ -51,7 +52,7 @@ public class CompressController {
this.pdfDocumentFactory = pdfDocumentFactory;
}
- private void compressImagesInPDF(Path pdfFile, double initialScaleFactor) throws Exception {
+ private void compressImagesInPDF(Path pdfFile, double initialScaleFactor, boolean grayScale) throws Exception {
byte[] fileBytes = Files.readAllBytes(pdfFile);
try (PDDocument doc = Loader.loadPDF(fileBytes)) {
double scaleFactor = initialScaleFactor;
@@ -76,11 +77,23 @@ public class CompressController {
bufferedImage.getScaledInstance(
newWidth, newHeight, Image.SCALE_SMOOTH);
- BufferedImage scaledBufferedImage =
- new BufferedImage(
- newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
- scaledBufferedImage.getGraphics().drawImage(scaledImage, 0, 0, null);
-
+ BufferedImage scaledBufferedImage;
+ if (grayScale
+ || bufferedImage.getType() == BufferedImage.TYPE_BYTE_GRAY) {
+ scaledBufferedImage =
+ new BufferedImage(
+ newWidth, newHeight, BufferedImage.TYPE_BYTE_GRAY);
+ scaledBufferedImage
+ .getGraphics()
+ .drawImage(scaledImage, 0, 0, null);
+ } else {
+ scaledBufferedImage =
+ new BufferedImage(
+ newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
+ scaledBufferedImage
+ .getGraphics()
+ .drawImage(scaledImage, 0, 0, null);
+ }
ByteArrayOutputStream compressedImageStream =
new ByteArrayOutputStream();
ImageIO.write(scaledBufferedImage, "jpeg", compressedImageStream);
@@ -139,6 +152,7 @@ public class CompressController {
}
boolean sizeMet = false;
+ boolean grayscaleEnabled = Boolean.TRUE.equals(request.getGrayscale());
while (!sizeMet && optimizeLevel <= 9) {
// Apply additional image compression for levels 6-9
@@ -152,7 +166,7 @@ public class CompressController {
case 9 -> 0.5; // 60% of original size
default -> 1.0;
};
- compressImagesInPDF(tempInputFile, scaleFactor);
+ compressImagesInPDF(tempInputFile, scaleFactor, grayscaleEnabled);
}
// Run QPDF optimization
@@ -169,6 +183,7 @@ public class CompressController {
command.add("--compression-level=" + optimizeLevel);
command.add("--compress-streams=y");
command.add("--object-streams=generate");
+ command.add("--no-warn");
command.add(tempInputFile.toString());
command.add(tempOutputFile.toString());
diff --git a/src/main/java/stirling/software/SPDF/model/api/misc/OptimizePdfRequest.java b/src/main/java/stirling/software/SPDF/model/api/misc/OptimizePdfRequest.java
index 5ddfba577..48c95086d 100644
--- a/src/main/java/stirling/software/SPDF/model/api/misc/OptimizePdfRequest.java
+++ b/src/main/java/stirling/software/SPDF/model/api/misc/OptimizePdfRequest.java
@@ -29,4 +29,13 @@ public class OptimizePdfRequest extends PDFFile {
"Whether to normalize the PDF content for better compatibility. Default is false.",
defaultValue = "false")
private Boolean normalize = false;
+
+ @Schema(
+ description = "Whether to convert the PDF to grayscale. Default is false.",
+ defaultValue = "false")
+ private Boolean grayscale = false;
+
+ public Boolean getGrayscale() {
+ return grayscale;
+ }
}
diff --git a/src/main/resources/messages_ar_AR.properties b/src/main/resources/messages_ar_AR.properties
index 9b116fdfd..52f5dad11 100644
--- a/src/main/resources/messages_ar_AR.properties
+++ b/src/main/resources/messages_ar_AR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=تطبيق التدرج الرمادي للضغط
diff --git a/src/main/resources/messages_az_AZ.properties b/src/main/resources/messages_az_AZ.properties
index 1854f8825..9ceb9b386 100644
--- a/src/main/resources/messages_az_AZ.properties
+++ b/src/main/resources/messages_az_AZ.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Sıxma üçün Boz Rəng Tətbiq Edin
diff --git a/src/main/resources/messages_bg_BG.properties b/src/main/resources/messages_bg_BG.properties
index 5f7702b65..df835f4fb 100644
--- a/src/main/resources/messages_bg_BG.properties
+++ b/src/main/resources/messages_bg_BG.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Версия
validateSignature.cert.keyUsage=Предназначение на ключа за използване
validateSignature.cert.selfSigned=Самостоятелно подписан
validateSignature.cert.bits=битове
+compress.grayscale.label=Приложи сива скала за компресиране
diff --git a/src/main/resources/messages_ca_CA.properties b/src/main/resources/messages_ca_CA.properties
index 3a3661427..ed00145f0 100644
--- a/src/main/resources/messages_ca_CA.properties
+++ b/src/main/resources/messages_ca_CA.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplicar escala de grisos per a la compressió
diff --git a/src/main/resources/messages_cs_CZ.properties b/src/main/resources/messages_cs_CZ.properties
index c77901d01..d3eb1701e 100644
--- a/src/main/resources/messages_cs_CZ.properties
+++ b/src/main/resources/messages_cs_CZ.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Verze
validateSignature.cert.keyUsage=Použití klíče
validateSignature.cert.selfSigned=Podepsaný sám sebou
validateSignature.cert.bits=bitů
+compress.grayscale.label=Použít stupnici šedi pro kompresi
diff --git a/src/main/resources/messages_da_DK.properties b/src/main/resources/messages_da_DK.properties
index 7db1bd532..795d0b62e 100644
--- a/src/main/resources/messages_da_DK.properties
+++ b/src/main/resources/messages_da_DK.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Anvend gråskala til komprimering
diff --git a/src/main/resources/messages_de_DE.properties b/src/main/resources/messages_de_DE.properties
index ef442185a..6dfac6225 100644
--- a/src/main/resources/messages_de_DE.properties
+++ b/src/main/resources/messages_de_DE.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Schlüsselverwendung
validateSignature.cert.selfSigned=Selbstsigniert
validateSignature.cert.bits=bits
+compress.grayscale.label=Graustufen für Komprimierung anwenden
diff --git a/src/main/resources/messages_el_GR.properties b/src/main/resources/messages_el_GR.properties
index 554ff22e8..0bc7ad5be 100644
--- a/src/main/resources/messages_el_GR.properties
+++ b/src/main/resources/messages_el_GR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Έκδοση
validateSignature.cert.keyUsage=Χρήση κλειδιού
validateSignature.cert.selfSigned=Αυτο-υπογεγραμμένο
validateSignature.cert.bits=bits
+compress.grayscale.label=Εφαρμογή κλίμακας του γκρι για συμπίεση
diff --git a/src/main/resources/messages_en_GB.properties b/src/main/resources/messages_en_GB.properties
index a77d36714..9c2d0b55a 100644
--- a/src/main/resources/messages_en_GB.properties
+++ b/src/main/resources/messages_en_GB.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Apply Grayscale for Compression
diff --git a/src/main/resources/messages_en_US.properties b/src/main/resources/messages_en_US.properties
index b1bfeaab4..cde27df13 100644
--- a/src/main/resources/messages_en_US.properties
+++ b/src/main/resources/messages_en_US.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Apply Grayscale for Compression
diff --git a/src/main/resources/messages_es_ES.properties b/src/main/resources/messages_es_ES.properties
index 0124b9e4c..ec70810df 100644
--- a/src/main/resources/messages_es_ES.properties
+++ b/src/main/resources/messages_es_ES.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplicar escala de grises para compresión
diff --git a/src/main/resources/messages_eu_ES.properties b/src/main/resources/messages_eu_ES.properties
index 2a62b8fa3..53fcf4282 100644
--- a/src/main/resources/messages_eu_ES.properties
+++ b/src/main/resources/messages_eu_ES.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplikatu grisezko eskala konpresiorako
diff --git a/src/main/resources/messages_fa_IR.properties b/src/main/resources/messages_fa_IR.properties
index ffac791c8..0b327f5c8 100644
--- a/src/main/resources/messages_fa_IR.properties
+++ b/src/main/resources/messages_fa_IR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=نسخه
validateSignature.cert.keyUsage=کاربرد کلید
validateSignature.cert.selfSigned=با امضای خود
validateSignature.cert.bits=بیتها
+compress.grayscale.label=اعمال مقیاس خاکستری برای فشردهسازی
diff --git a/src/main/resources/messages_fr_FR.properties b/src/main/resources/messages_fr_FR.properties
index 08a669f56..4af67d133 100644
--- a/src/main/resources/messages_fr_FR.properties
+++ b/src/main/resources/messages_fr_FR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Usage de la clé
validateSignature.cert.selfSigned=Auto-signé
validateSignature.cert.bits=bits
+compress.grayscale.label=Appliquer l'échelle de gris pour la compression
diff --git a/src/main/resources/messages_ga_IE.properties b/src/main/resources/messages_ga_IE.properties
index 34b571c5f..bbf1131de 100644
--- a/src/main/resources/messages_ga_IE.properties
+++ b/src/main/resources/messages_ga_IE.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Leagan
validateSignature.cert.keyUsage=Úsáid Eochrach
validateSignature.cert.selfSigned=Féin-Sínithe
validateSignature.cert.bits=giotáin
+compress.grayscale.label=Cuir Scála Liath i bhFeidhm le Comhbhrú
diff --git a/src/main/resources/messages_hi_IN.properties b/src/main/resources/messages_hi_IN.properties
index 472b71c64..3a5fb5b8a 100644
--- a/src/main/resources/messages_hi_IN.properties
+++ b/src/main/resources/messages_hi_IN.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=संस्करण
validateSignature.cert.keyUsage=कुंजी उपयोग
validateSignature.cert.selfSigned=स्व-हस्ताक्षरित
validateSignature.cert.bits=बिट्स
+compress.grayscale.label=संपीड़न के लिए ग्रेस्केल लागू करें
diff --git a/src/main/resources/messages_hr_HR.properties b/src/main/resources/messages_hr_HR.properties
index e25d901a5..f56e326e9 100644
--- a/src/main/resources/messages_hr_HR.properties
+++ b/src/main/resources/messages_hr_HR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Primijeni sivinu za kompresiju
diff --git a/src/main/resources/messages_hu_HU.properties b/src/main/resources/messages_hu_HU.properties
index e89e8cdad..0a6f21a06 100644
--- a/src/main/resources/messages_hu_HU.properties
+++ b/src/main/resources/messages_hu_HU.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Verzió
validateSignature.cert.keyUsage=Kulcshasználat
validateSignature.cert.selfSigned=Önaláírt
validateSignature.cert.bits=bit
+compress.grayscale.label=Szürkeárnyalatok alkalmazása tömörítéshez
diff --git a/src/main/resources/messages_id_ID.properties b/src/main/resources/messages_id_ID.properties
index 4f2cc88cf..b869c9d34 100644
--- a/src/main/resources/messages_id_ID.properties
+++ b/src/main/resources/messages_id_ID.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Terapkan Skala Abu-Abu untuk Kompresi
diff --git a/src/main/resources/messages_it_IT.properties b/src/main/resources/messages_it_IT.properties
index bbd88bd09..a0f924ee6 100644
--- a/src/main/resources/messages_it_IT.properties
+++ b/src/main/resources/messages_it_IT.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Versione
validateSignature.cert.keyUsage=Utilizzo della chiave
validateSignature.cert.selfSigned=Autofirmato
validateSignature.cert.bits=bit
+compress.grayscale.label=Applica scala di grigio per la compressione
diff --git a/src/main/resources/messages_ja_JP.properties b/src/main/resources/messages_ja_JP.properties
index 1f0e4d710..0f7c85082 100644
--- a/src/main/resources/messages_ja_JP.properties
+++ b/src/main/resources/messages_ja_JP.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=バージョン
validateSignature.cert.keyUsage=キーの使用法
validateSignature.cert.selfSigned=自己署名
validateSignature.cert.bits=ビット
+compress.grayscale.label=圧縮にグレースケールを適用する
diff --git a/src/main/resources/messages_ko_KR.properties b/src/main/resources/messages_ko_KR.properties
index c102b0fa6..21a20db07 100644
--- a/src/main/resources/messages_ko_KR.properties
+++ b/src/main/resources/messages_ko_KR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=버전
validateSignature.cert.keyUsage=키 용도
validateSignature.cert.selfSigned=자체 서명
validateSignature.cert.bits=비트
+compress.grayscale.label=압축을 위해 그레이스케일 적용
diff --git a/src/main/resources/messages_nl_NL.properties b/src/main/resources/messages_nl_NL.properties
index 0820703fd..a3e754a13 100644
--- a/src/main/resources/messages_nl_NL.properties
+++ b/src/main/resources/messages_nl_NL.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Grijsschaal toepassen voor compressie
diff --git a/src/main/resources/messages_no_NB.properties b/src/main/resources/messages_no_NB.properties
index 8b820a7b2..cfb8dbaea 100644
--- a/src/main/resources/messages_no_NB.properties
+++ b/src/main/resources/messages_no_NB.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Bruk gråskala for komprimering
diff --git a/src/main/resources/messages_pl_PL.properties b/src/main/resources/messages_pl_PL.properties
index c7575ecc9..166fff51f 100644
--- a/src/main/resources/messages_pl_PL.properties
+++ b/src/main/resources/messages_pl_PL.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Zastosuj skalę szarości do kompresji
diff --git a/src/main/resources/messages_pt_BR.properties b/src/main/resources/messages_pt_BR.properties
index 30a57ee56..73c1e6d8d 100644
--- a/src/main/resources/messages_pt_BR.properties
+++ b/src/main/resources/messages_pt_BR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Versão
validateSignature.cert.keyUsage=Uso da chave
validateSignature.cert.selfSigned=Autoassinados
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplicar escala de cinza para compressão
diff --git a/src/main/resources/messages_pt_PT.properties b/src/main/resources/messages_pt_PT.properties
index 9c0ce181c..d26e33318 100644
--- a/src/main/resources/messages_pt_PT.properties
+++ b/src/main/resources/messages_pt_PT.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Versão
validateSignature.cert.keyUsage=Utilização da Chave
validateSignature.cert.selfSigned=Auto-Assinado
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplicar escala de cinzentos para compressão
diff --git a/src/main/resources/messages_ro_RO.properties b/src/main/resources/messages_ro_RO.properties
index b12368e74..6a861e116 100644
--- a/src/main/resources/messages_ro_RO.properties
+++ b/src/main/resources/messages_ro_RO.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Aplicare scală de gri pentru compresie
diff --git a/src/main/resources/messages_ru_RU.properties b/src/main/resources/messages_ru_RU.properties
index 6e4d1b47c..f407f0ae2 100644
--- a/src/main/resources/messages_ru_RU.properties
+++ b/src/main/resources/messages_ru_RU.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Версия
validateSignature.cert.keyUsage=Использование ключа
validateSignature.cert.selfSigned=Самоподписанный
validateSignature.cert.bits=бит
+compress.grayscale.label=Применить шкалу серого для сжатия
diff --git a/src/main/resources/messages_sk_SK.properties b/src/main/resources/messages_sk_SK.properties
index 3c192ce1f..5e4b53e9c 100644
--- a/src/main/resources/messages_sk_SK.properties
+++ b/src/main/resources/messages_sk_SK.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Použiť odtiene šedej na kompresiu
diff --git a/src/main/resources/messages_sl_SI.properties b/src/main/resources/messages_sl_SI.properties
index aa18879cc..b07753d42 100644
--- a/src/main/resources/messages_sl_SI.properties
+++ b/src/main/resources/messages_sl_SI.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Različica
validateSignature.cert.keyUsage=Uporaba ključa
validateSignature.cert.selfSigned=Samopodpisano
validateSignature.cert.bits=bits
+compress.grayscale.label=Uporabi sivinsko lestvico za stiskanje
diff --git a/src/main/resources/messages_sr_LATN_RS.properties b/src/main/resources/messages_sr_LATN_RS.properties
index 078c097d0..1edeb8620 100644
--- a/src/main/resources/messages_sr_LATN_RS.properties
+++ b/src/main/resources/messages_sr_LATN_RS.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Primeni sivinu za kompresiju
diff --git a/src/main/resources/messages_sv_SE.properties b/src/main/resources/messages_sv_SE.properties
index 4c0c4113e..00aac4efc 100644
--- a/src/main/resources/messages_sv_SE.properties
+++ b/src/main/resources/messages_sv_SE.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Tillämpa gråskala för komprimering
diff --git a/src/main/resources/messages_th_TH.properties b/src/main/resources/messages_th_TH.properties
index 96c68f1fb..8a9bac5bc 100644
--- a/src/main/resources/messages_th_TH.properties
+++ b/src/main/resources/messages_th_TH.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=ใช้ระดับสีเทาสำหรับการบีบอัด
diff --git a/src/main/resources/messages_tr_TR.properties b/src/main/resources/messages_tr_TR.properties
index 3ecafba0b..35a6ad511 100644
--- a/src/main/resources/messages_tr_TR.properties
+++ b/src/main/resources/messages_tr_TR.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Sıkıştırma için Gri Ton Uygula
diff --git a/src/main/resources/messages_uk_UA.properties b/src/main/resources/messages_uk_UA.properties
index edabc7c14..55deb6fdd 100644
--- a/src/main/resources/messages_uk_UA.properties
+++ b/src/main/resources/messages_uk_UA.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Застосувати відтінки сірого для стиснення
diff --git a/src/main/resources/messages_vi_VN.properties b/src/main/resources/messages_vi_VN.properties
index e3b6d5b18..e5aab3f9f 100644
--- a/src/main/resources/messages_vi_VN.properties
+++ b/src/main/resources/messages_vi_VN.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=Version
validateSignature.cert.keyUsage=Key Usage
validateSignature.cert.selfSigned=Self-Signed
validateSignature.cert.bits=bits
+compress.grayscale.label=Áp dụng thang độ xám để nén
diff --git a/src/main/resources/messages_zh_BO.properties b/src/main/resources/messages_zh_BO.properties
index be8aae05b..ed1269b5a 100644
--- a/src/main/resources/messages_zh_BO.properties
+++ b/src/main/resources/messages_zh_BO.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=པར་གཞི།
validateSignature.cert.keyUsage=ལྡེ་མིག་བེད་སྤྱོད།
validateSignature.cert.selfSigned=རང་མིང་རྟགས།
validateSignature.cert.bits=གནས།
+compress.grayscale.label=应用灰度进行压缩
diff --git a/src/main/resources/messages_zh_CN.properties b/src/main/resources/messages_zh_CN.properties
index 7261a2432..86ae02cbb 100644
--- a/src/main/resources/messages_zh_CN.properties
+++ b/src/main/resources/messages_zh_CN.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=版本
validateSignature.cert.keyUsage=密钥用途
validateSignature.cert.selfSigned=自签名
validateSignature.cert.bits=比特
+compress.grayscale.label=应用灰度进行压缩
diff --git a/src/main/resources/messages_zh_TW.properties b/src/main/resources/messages_zh_TW.properties
index 17f993913..06b591048 100644
--- a/src/main/resources/messages_zh_TW.properties
+++ b/src/main/resources/messages_zh_TW.properties
@@ -1384,3 +1384,4 @@ validateSignature.cert.version=版本
validateSignature.cert.keyUsage=金鑰用途
validateSignature.cert.selfSigned=自我簽署
validateSignature.cert.bits=位元
+compress.grayscale.label=應用灰階進行壓縮
diff --git a/src/main/resources/templates/misc/compress-pdf.html b/src/main/resources/templates/misc/compress-pdf.html
index 54d6e61cc..e76a4b1c9 100644
--- a/src/main/resources/templates/misc/compress-pdf.html
+++ b/src/main/resources/templates/misc/compress-pdf.html
@@ -39,6 +39,13 @@
+
+
+
+
+