Author | Topic: Re: Problem saving PNG files on Windows XP | |
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Andreas Gehrs-Pahl View the complete thread for this message in: | Re: Problem saving PNG files on Windows XP on Mon, 02 Mar 2015 05:14:06 -0500 Thomas, >> As JPG files (of screen shots) are considerably larger than PNG files >Really? >That does not match with my experience at all. PNG is 100% loss-less, as it uses zip compression, resulting in very clear graphics. Screen Shots -- meaning Dialog (Input) Screens -- that contain (relatively) large areas with a single color and other repetitive areas, are perfect for very good zip compression results. If you have photos with random pixels and many different colors, JPGs will give you a much better result, as it is a (more or less) lossy compression that interpolates pixels and only saves some of them. JPGs using an 80% compression ratio will have pretty good quality, but will usually be 50% to 200% larger in size than a PNG file, if you save a dialog screen shot. And if you have a black and white graphic (with just 2 bits for color), a GIF file will be usually smaller than either PNG or JPG. Of course all of this is "usually" and "in general" and not an absolute. But in my experience, saving a screen shot of my application in PNG format will result in the smallest file, while giving the best picture quality, unless it is a screen shot that (just) shows a photo, of course. Andreas Andreas Gehrs-Pahl Absolute Software, LLC phone: (989) 723-9927 email: Andreas.GP@Charter.net web: http://www.Aerospace-History.net |