PNG Compression can now be set, writing uncompressed PNG's is significantly faster for high resolution images - 2k.

release/scripts/ui/properties_render.py

@@ -295,6 +295,7 @@ class RENDER_PT_output(RenderButtonsPanel):
         layout = self.layout
 
         rd = context.scene.render
+        file_format = rd.file_format
         wide_ui = context.region.width > narrowui
 
         layout.prop(rd, "output_path", text="")
@@ -310,11 +311,15 @@ class RENDER_PT_output(RenderButtonsPanel):
         col.prop(rd, "use_overwrite")
         col.prop(rd, "use_placeholder")
 
-        if rd.file_format in ('AVI_JPEG', 'JPEG'):
+        if file_format in ('AVI_JPEG', 'JPEG'):
             split = layout.split()
             split.prop(rd, "file_quality", slider=True)
+        
+        if file_format == 'PNG':
+            split = layout.split()
+            split.prop(rd, "file_quality", slider=True, text="Compression")
 
-        elif rd.file_format == 'MULTILAYER':
+        elif file_format == 'MULTILAYER':
             split = layout.split()
 
             col = split.column()
@@ -323,7 +328,7 @@ class RENDER_PT_output(RenderButtonsPanel):
             if wide_ui:
                 col = split.column()
 
-        elif rd.file_format == 'OPEN_EXR':
+        elif file_format == 'OPEN_EXR':
             split = layout.split()
 
             col = split.column()
@@ -340,7 +345,7 @@ class RENDER_PT_output(RenderButtonsPanel):
                 col = subsplit.column()
             col.prop(rd, "exr_preview")
 
-        elif rd.file_format == 'JPEG2000':
+        elif file_format == 'JPEG2000':
             split = layout.split()
             col = split.column()
             col.label(text="Depth:")
@@ -351,7 +356,7 @@ class RENDER_PT_output(RenderButtonsPanel):
             col.prop(rd, "jpeg2k_preset", text="")
             col.prop(rd, "jpeg2k_ycc")
 
-        elif rd.file_format in ('CINEON', 'DPX'):
+        elif file_format in ('CINEON', 'DPX'):
             split = layout.split()
             col = split.column()
             col.prop(rd, "cineon_log", text="Convert to Log")
@@ -363,15 +368,15 @@ class RENDER_PT_output(RenderButtonsPanel):
             col.prop(rd, "cineon_white", text="White")
             col.prop(rd, "cineon_gamma", text="Gamma")
 
-        elif rd.file_format == 'TIFF':
+        elif file_format == 'TIFF':
             split = layout.split()
             split.prop(rd, "tiff_bit")
 
-        elif rd.file_format == 'QUICKTIME_CARBON':
+        elif file_format == 'QUICKTIME_CARBON':
             split = layout.split()
             split.operator("scene.render_data_set_quicktime_codec")
 
-        elif rd.file_format == 'QUICKTIME_QTKIT':
+        elif file_format == 'QUICKTIME_QTKIT':
             split = layout.split()
             col = split.column()
             col.prop(rd, "quicktime_codec_type", text="Video Codec")

source/blender/blenkernel/intern/image.c

@@ -1180,6 +1180,10 @@ int BKE_write_ibuf(Scene *scene, ImBuf *ibuf, char *name, int imtype, int subimt
 	}
 	else if (ELEM5(imtype, R_PNG, R_FFMPEG, R_H264, R_THEORA, R_XVID)) {
 		ibuf->ftype= PNG;
+
+		if(imtype==R_PNG)
+			ibuf->ftype |= quality;  /* quality is actually compression 0-100 --> 0-9 */
+
 	}
 #ifdef WITH_DDS
 	else if ((imtype==R_DDS)) {

source/blender/editors/space_sequencer/sequencer_draw.c

@@ -850,8 +850,6 @@ void draw_image_seq(const bContext* C, Scene *scene, ARegion *ar, SpaceSeq *sseq
 		/* border */
 		setlinestyle(3);
 
-		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-
 		UI_ThemeColorBlendShade(TH_WIRE, TH_BACK, 1.0, 0);
 
 		glBegin(GL_LINE_LOOP);
@@ -873,14 +871,16 @@ void draw_image_seq(const bContext* C, Scene *scene, ARegion *ar, SpaceSeq *sseq
 			y1+= a;
 			y2-= a;
 
+			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+
 			uiSetRoundBox(15);
 			gl_round_box(GL_LINE_LOOP, x1, y1, x2, y2, 12.0);
 
+			glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+
 		}
 
 		setlinestyle(0);
-
-		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 	}
 	
 	/* draw grease-pencil (image aligned) */

source/blender/imbuf/intern/png.c

@@ -103,6 +103,11 @@ int imb_savepng(struct ImBuf *ibuf, char *name, int flags)
 	int i, bytesperpixel, color_type = PNG_COLOR_TYPE_GRAY;
 	FILE *fp = 0;
 
+	/* use the jpeg quality setting for compression */
+	int compression;
+	compression= (int)(((float)(ibuf->ftype & 0xff) / 11.1111f));
+	compression= compression < 0 ? 0 : (compression > 9 ? 9 : compression);
+
 	bytesperpixel = (ibuf->depth + 7) >> 3;
 	if ((bytesperpixel > 4) || (bytesperpixel == 2)) {
 		printf("imb_savepng: unsupported bytes per pixel: %d\n", bytesperpixel);
@@ -201,10 +206,10 @@ int imb_savepng(struct ImBuf *ibuf, char *name, int flags)
 		PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
 		PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
 		PNG_ALL_FILTERS);
-
-	png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
 	*/
 
+	png_set_compression_level(png_ptr, compression);
+
 	// png image settings
 	png_set_IHDR(png_ptr,
 		 info_ptr,

source/blender/makesrna/intern/rna_scene.c

@@ -2037,8 +2037,8 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
 	
 	prop= RNA_def_property(srna, "file_quality", PROP_INT, PROP_PERCENTAGE);
 	RNA_def_property_int_sdna(prop, NULL, "quality");
-	RNA_def_property_range(prop, 1, 100);
-	RNA_def_property_ui_text(prop, "Quality", "Quality of JPEG images, AVI Jpeg and SGI movies");
+	RNA_def_property_range(prop, 0, 100); /* 0 is needed for compression. */
+	RNA_def_property_ui_text(prop, "Quality", "Quality of JPEG images, AVI Jpeg and SGI movies, Compression for PNG's");
 	RNA_def_property_update(prop, NC_SCENE|ND_RENDER_OPTIONS, NULL);
 	
 	/* Tiff */