Changes to black compression and saturation controls. Black compression from 0-50 acts the same as 0-100 on the previous version, compressing dark tones without crushing blacks. 50-100 then starts crushing blacks until by 100 on the slider, all tones up to the set black point are sent to zero. In the new saturation control, negative values of the slider set a linear curve rather than an inverted S curve, and smoothly decrease saturation to zero across the board.

rtengine/image8.h

@@ -0,0 +1,71 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
+ *
+ *  RawTherapee is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  RawTherapee is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+//
+// A class representing a 8 bit rgb image without alpha channel
+//
+#ifndef _IMAGE8_
+#define _IMAGE8_
+
+#include <imageio.h>
+#include <rtengine.h>
+
+namespace rtengine {
+
+class Image8 : public ImageIO, public IImage8 {
+
+    public:
+        unsigned char* data;
+        int width;
+        int height;
+        
+        Image8 ();
+        Image8 (int width, int height);
+       ~Image8 ();
+     
+        unsigned char r (int row, int col);
+        unsigned char g (int row, int col);
+        unsigned char b (int row, int col);
+        void r (int row, int col, unsigned char val);
+        void g (int row, int col, unsigned char val);
+        void b (int row, int col, unsigned char val);
+    
+        virtual int     getW            () { return width;  }
+        virtual int     getH            () { return height; }
+        virtual void    allocate        (int width, int height);
+        virtual int     getBPS          () { return 8; }
+        virtual void    getScanline     (int row, unsigned char* buffer, int bps);
+        virtual void    setScanline     (int row, unsigned char* buffer, int bps);
+    
+        // functions inherited from IImage*:
+        virtual Glib::Mutex& getMutex () { return mutex (); }
+        virtual cmsHPROFILE getProfile () { return getEmbeddedProfile (); }
+        virtual int getWidth ()  { return width; }
+        virtual int getHeight () { return height; }
+        virtual int getBitsPerPixel () { return 16; }
+        virtual int saveToFile (Glib::ustring fname) { return save (fname); }
+        virtual int saveAsPNG  (Glib::ustring fname, int compression = -1, int bps = -1) { return savePNG (fname, compression, bps); }
+        virtual int saveAsJPEG (Glib::ustring fname, int quality = 100) { return saveJPEG (fname, quality); }
+        virtual int saveAsTIFF (Glib::ustring fname, int bps = -1, bool uncompressed = false) { return saveTIFF (fname, bps, uncompressed); }
+        virtual void setSaveProgressListener (ProgressListener* pl) { setProgressListener (pl); } 
+        virtual void free () { delete this; }
+        virtual const unsigned char* getData () { return data; }
+
+};
+};
+#endif