hbruun Posted January 23, 2009 Share Posted January 23, 2009 I use Paint.net a bunch and love it. Today I ran into an odd thing though... I was editing an existing JPG image and was doing some cropping to it and then saving the cropped image. I noticed that the new image was losing significant quality. I have quality set to 100%. Any ideas? I'm attaching two pictures to demonstrate the issue. One is a portion of the image that I'm starting with, the other is a capture showing how the save operation loses quality... the most obvious portion is the fairly bright red horizontal line in the picture (ends up looking much dimmer in the new image). Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted January 23, 2009 Share Posted January 23, 2009 100% JPEG quality does not mean lossless. JPEG is working as intended. If you want lossless, then use PNG. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
hbruun Posted January 23, 2009 Author Share Posted January 23, 2009 PNG loses the quality too (I tried that earlier) Other tools such as FastStone Image Viewer and Gimp can handle saving this file without losing the quality. In the case of FastStone I get to preserve the quality by selecting what they call a 'Photometric = RGB' Quote Link to comment Share on other sites More sharing options...
I Like Pi Posted January 23, 2009 Share Posted January 23, 2009 PNG should not lose quality as long as you select the "Auto-detect" option. Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted January 23, 2009 Share Posted January 23, 2009 PNG does not lose quality unless you choose something like 8-bit, and you're saving from an image with more than 255 colors. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
hbruun Posted January 23, 2009 Author Share Posted January 23, 2009 I would have agreed with you both until yesterday. 'I Like Pi', I see that you created a test.png from my test.jpg... put them side by side and you'll see that the colors got changed significantly. Brewster, I've tried both 'Autodetect' and 32-bit for the png settings and the same color changes occur. Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted January 23, 2009 Share Posted January 23, 2009 If the colors are different then you're using Internet Explorer which is known to have gamma "issues". Simple as that. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
hbruun Posted January 23, 2009 Author Share Posted January 23, 2009 It is not a browser issue as the color changes become apparent immediately (even in Paint.net's save preview window). I placed the original test.jpg next to 'I Love Pi''s test.png to make it more clear how things change during the save of the new file (attached here). Quote Link to comment Share on other sites More sharing options...
Aethec Posted January 23, 2009 Share Posted January 23, 2009 It is a browser issue. Here's what I see in Firefox 3.1 b2 : If I put both in two layers in PDN and select Difference blending mode, all that I can see is black. Quote Link to comment Share on other sites More sharing options...
hbruun Posted January 23, 2009 Author Share Posted January 23, 2009 I agree that the browsers don't help the situation. Firefox 3.1 b2 shows the PNG file as a darker red than IE (the various paint programs do not have that problem with the PNG). So I still think there is room for improvement in Paint.net since the PNGs that can be created are being displayed differently in the various browsers (not Paint.net's fault) and the JPGs created lose accuracy/quality. I'm calling it an improvement since other paint programs have found a way to deal with it. I'm including screen shots how how two others handle it with no loss of quality (their JPG save options). Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted January 23, 2009 Share Posted January 23, 2009 The probably also have their own JPEG codecs, instead of using the minimally configurable ones provided by the system (in this case, .NET and GDI+ or WIC). Lots and lots and lots more code there. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
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