Fergal Posted November 13, 2006 Share Posted November 13, 2006 I've noticed that when I create a .png file with any program, then open it in Paint.net and save it again, the file size is increased by 30% or so. Why does paint.net save png files a lot bigger than photoshop or even the screenshot utility I use? Quote Link to comment Share on other sites More sharing options...
barkbark00 Posted November 13, 2006 Share Posted November 13, 2006 Are you making any changes to the file once it is in PdN? EDIT: Nevermind. I tried it myself and there was about a 20% increase with no changes made to the file. Quote Take responsibility for your own intelligence. 😉 -Rick Brewster Link to comment Share on other sites More sharing options...
Leif Posted November 13, 2006 Share Posted November 13, 2006 I newer noticed that. But I have noticed that if I need to make a PNG file smaller, it sometimes can be done by opening it in IrfanView, and saving it again. I naturally assume it looses some quality. Quote My DA: http://leif-j.deviantart.com/ -------------- Some people seek justice so persistent, that they will do great injustice themselves. Link to comment Share on other sites More sharing options...
Rick Brewster Posted November 13, 2006 Share Posted November 13, 2006 PNG is lossless, you won't lose quality. This could just be a consequence of Paint.NET saving PNG's as 32-bit (24-bit RGB + 8-bit alpha/transparency), even if the image is opaque. 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...
TinSoldier Posted November 13, 2006 Share Posted November 13, 2006 There is something going on here... I took a PNG file that I had created in PDN earlier (part of a comic snipped from a jpeg) and once I was done doing everything, it's filesize when saved as a PNG was 18473 bytes. Later, I opened the file and saved it (without changing anything except the pathname) and it was 19067 bytes. Subsequently saving the file gave the same result; it did not continue to increase in size. I noticed the files had metadata added saying Paint.NET v3.0. The original did not have that. But that leaves about 580 bytes unaccounted for. Also, for those not afraid of the command line, I've found pngUtils which can help shrink your PNG files. Most useful was pngquant which can take your 24-bit PNG file and make it an 8-bit pallette indexed file. Quote Link to comment Share on other sites More sharing options...
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