Harmonizied ICC profile handling between JTL and CVT and replaced EMBED_ICC startup parameter with more flexible MAX_ICC parameter, which defines the maximum acceptable size for an ICC profile.

Profiles larger than this are stripped out of the output image. If set to -1, profiles are always added and if set to 0 never.

Author: ruven

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: ruven

ChangeLog

@@ -1,3 +1,10 @@
+14/02/2024:
+	- Harmonizied ICC profile handling between JTL and CVT and replaced EMBED_ICC startup parameter with
+	  more flexible MAX_ICC parameter, which defines the maximum acceptable size for an ICC profile.
+	  Profiles larger than this are stripped out of the output image. If set to -1, profiles are always
+	  added and if set to 0 never.
+
+
 14/01/2025:
 	- Fix to TPTImage string concatenation bug, elimination of type warnings and documentation updates
 

README

@@ -451,8 +451,7 @@ URI_MAP: Set a mapping from a URL prefix to a supported protocol. This enables i
 
 CACHE_CONTROL: Set the HTTP Cache-Control header. See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9 for a full list of options. If not set, header defaults to "max-age=86400" (24 hours).
 
-EMBED_ICC: Set whether the ICC profile is embedded within the output image.
-0 to strip profile, 1 to embed profile. The default is 1 (embedded profiles).
+MAX_ICC: Set the maximum ICC profile size in bytes that is allowed to be embedded within an output image. This is set by default to 65535 bytes. If set to -1, no limit is set and all profiles are embedded. If set to 0, no profiles are embedded.
 
 OMP_NUM_THREADS: Set the number of OpenMP threads to be used by the iipsrv image processing routines (See OpenMP specification for details). All available processor threads are used by default.
 

src/CVT.cc

@@ -1,7 +1,7 @@
 /*
     IIP CVT Command Handler Class Member Function
 
-    Copyright (C) 2006-2024 Ruven Pillay.
+    Copyright (C) 2006-2025 Ruven Pillay.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -511,9 +511,9 @@ void CVT::send( Session* session ){
     }
   }
 
-  // Embed ICC profile if of a reasonable size
-  if( session->view->embedICC() && ((*session->image)->getMetadata("icc").size()>0) ){
-    if( (*session->image)->getMetadata("icc").size() < 65536 ){
+  // Embed ICC profile if we have one and it is of an acceptable size
+  if( (*session->image)->getMetadata("icc").size() > 0 ){
+    if( session->view->maxICC() == -1 || (*session->image)->getMetadata("icc").size() < (unsigned long) session->view->maxICC() ){
       if( session->loglevel >= 3 ){
 	*(session->logfile) << "CVT :: Embedding ICC profile with size "
 			    << (*session->image)->getMetadata("icc").size() << " bytes" << endl;

src/Environment.h

@@ -1,7 +1,7 @@
 /*
     IIP Environment Variable Class
 
-    Copyright (C) 2006-2024 Ruven Pillay
+    Copyright (C) 2006-2025 Ruven Pillay
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -51,7 +51,7 @@
 #define CACHE_CONTROL "max-age=86400";  // 24 hours
 #define ALLOW_UPSCALING true
 #define URI_MAP ""
-#define EMBED_ICC true
+#define MAX_ICC 65536 // Max ICC profile size of 65k
 #define CODEC_PASSTHROUGH true
 #define KAKADU_READMODE 0
 #define IIIF_VERSION 3
@@ -381,12 +381,14 @@ class Environment {
   }
 
 
-  static unsigned int getEmbedICC(){
-    const char* envpara = getenv( "EMBED_ICC" );
-    bool embed;
-    if( envpara ) embed = atoi( envpara );
-    else embed = EMBED_ICC;
-    return embed;
+  static int getMaxICC(){
+    const char* envpara = getenv( "MAX_ICC" );
+    int max_icc;
+    if( envpara ){
+      max_icc = atoi( envpara );
+    }
+    else max_icc = MAX_ICC;
+    return max_icc;
   }
 
 

src/JTL.cc

@@ -1,7 +1,7 @@
 /*
     IIP JTL Command Handler Class Member Function: Export a single tile
 
-    Copyright (C) 2006-2024 Ruven Pillay.
+    Copyright (C) 2006-2025 Ruven Pillay.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -149,17 +149,24 @@ void JTL::send( Session* session, int resolution, int tile ){
   compressor->setMetadata( (*session->image)->metadata );
 
 
-  // Embed ICC profile
-  if( session->view->embedICC() && (*session->image)->metadata["icc"].size() > 0 ){
-    if( session->loglevel >= 3 ){
-      *(session->logfile) << "JTL :: Embedding ICC profile with size "
-			  << (*session->image)->getMetadata("icc").size() << " bytes" << endl;
+  // Embed ICC profile if we have one and it is of an acceptable size
+  if( (*session->image)->getMetadata("icc").size() > 0 ){
+    if( session->view->maxICC() == -1 || (*session->image)->getMetadata("icc").size() < (unsigned long) session->view->maxICC() ){
+      if( session->loglevel >= 3 ){
+	*(session->logfile) << "JTL :: Embedding ICC profile with size "
+			    << (*session->image)->getMetadata("icc").size() << " bytes" << endl;
+      }
+      compressor->embedICCProfile( true );
+    }
+    else{
+      if( session->loglevel >= 3 ){
+	*(session->logfile) << "JTL :: ICC profile with size "
+			    << (*session->image)->getMetadata("icc").size() << " bytes is too large: Not embedding" << endl;
+      }
     }
-    compressor->embedICCProfile( true );
   }
 
 
-
   RawTile rawtile = tilemanager.getTile( resolution, tile, session->view->xangle,
 					 session->view->yangle, session->view->getLayers(), ct );
 

src/Main.cc

@@ -1,7 +1,7 @@
 /*
     IIP FCGI server module - Main loop.
 
-    Copyright (C) 2000-2024 Ruven Pillay
+    Copyright (C) 2000-2025 Ruven Pillay
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -345,8 +345,8 @@ int main( int argc, char *argv[] )
   bool allow_upscaling = Environment::getAllowUpscaling();
 
 
-  // Get the ICC embedding setting
-  bool embed_icc = Environment::getEmbedICC();
+  // Get the max ICC profile size we allow to be embedded
+  int max_icc = Environment::getMaxICC();
 
 
   // Get codec passthrough setting
@@ -429,7 +429,9 @@ int main( int argc, char *argv[] )
       else logfile << max_layers << endl;
     }
     logfile << "Setting Allow Upscaling to " << (allow_upscaling? "true" : "false") << endl;
-    logfile << "Setting ICC profile embedding to " << (embed_icc? "true" : "false") << endl;
+    logfile << "Setting maximum ICC profile size to ";
+    if( max_icc < 0 ) logfile << "unlimited" << endl;
+    else logfile << max_icc << " bytes" << endl;
     logfile << "Setting codec passthrough to " << (IIPImage::codec_passthrough? "true" : "false") << endl;
     if( !copyright.empty() ) logfile << "Setting default rights/copyright statement to '" << copyright << "'" << endl;
     logfile << "Setting up TIFF support via " << TPTImage::getCodecVersion() << endl;
@@ -658,7 +660,7 @@ int main( int argc, char *argv[] )
     if( max_CVT != 0 ) view.setMaxSize( max_CVT );
     if( max_layers != 0 ) view.setMaxLayers( max_layers );
     view.setAllowUpscaling( allow_upscaling );
-    view.setEmbedICC( embed_icc );
+    view.setMaxICC( max_icc );
 
 
     // Create an IIPResponse object - we use this for the OBJ requests.

src/View.h

@@ -1,7 +1,7 @@
 /*
     Image View and Transform Parameters
 
-    Copyright (C) 2003-2024 Ruven Pillay.
+    Copyright (C) 2003-2025 Ruven Pillay.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -76,7 +76,7 @@ class View{
   int flip;                                   /// Flip (1=horizontal, 2=vertical)
   bool maintain_aspect;                       /// Indicate whether aspect ratio should be maintained
   bool allow_upscaling;                       /// Indicate whether images may be served larger than the source file
-  bool embed_icc;                             /// Indicate whether we should embed ICC profiles
+  int max_icc;                                /// Maximum ICC profile size we allow to be embedded
   ImageEncoding output_format;                /// Requested output format
   float contrast;                             /// Contrast adjustment requested by CNT command
   float gamma;                                /// Gamma adjustment requested by GAM command
@@ -102,7 +102,7 @@ class View{
     maintain_aspect = true;
     allow_upscaling = true;
     colorspace = ColorSpace::NONE;
-    embed_icc = true;
+    max_icc = -1;
     output_format = ImageEncoding::JPEG;
     equalization = false;
     minmax = false;
@@ -134,20 +134,20 @@ class View{
   bool allowUpscaling(){ return allow_upscaling; };
 
 
-  /// Set the embed_icc flag
-  /** @param embed embed icc profile flag
+  /// Set the maximum ICC profile size we allow to be embedded
+  /** @param max maximum icc profile size
    */
-  void setEmbedICC( bool embed ){ embed_icc = embed; };
+  void setMaxICC( int max ){ max_icc = max; };
 
 
-  /// Get the embed_icc flag - disable in case of certain types of processing
-  /** @return whether ICC profile should be embedded
+  /// Get the maximum ICC profile size we allow to be embedded - disable if certain processing has been carried out
+  /** @return max ICC profile size
    */
-  bool embedICC(){
+  int maxICC(){
     // Disable if colour-mapping, twist, hill-shading or greyscale conversion applied
-    if( cmapped || shaded || ctw.size() || colorspace==ColorSpace::GREYSCALE ) return false;
-    return embed_icc;
-  };
+    if( cmapped || shaded || ctw.size() || colorspace==ColorSpace::GREYSCALE ) return 0;
+    return max_icc;
+  }
 
 
   /// Set the maximum view port dimension