On Mon, Feb 24, 2003 at 02:30:10PM +0000, Anne Wilson wrote: > On Monday 24 Feb 2003 1:43 pm, Todd Slater wrote: > > On Mon, Feb 24, 2003 at 12:41:29PM +0000, Anne Wilson wrote: > > > I thought that png was a lossless compression - am I wrong? > > > > > > If I start from a jpg file from my camera, 397 KB, why does saving it as > > > a png come out at 2.4MB? > > > > > > Anne > > > > As a general rule of thumb, .jpg for photos, .png for computer-generated > > graphics/images. As somebody else pointed out, .pngs are superior to > > .jpgs for screenshots. And use .pngs to replace .gifs, typically for > > web graphics (buttons, banners etc.). > > > > Regarding your query, lossless means bigger files. > > > > Todd > > I had thought that it could only record what the jpg was already giving it, so > had expected the compression to come out at a similar size. As an experiment > I took a jpg that had been saved as a png, then saved it again as a bmp. I > had thought 2.7 MB was bit, but the bmp came out at 5.5 MB, so I guess png is > doing quite a good job of compression where data preservation is important. > > Anne
I like .tif for compatibility. That would probably rival .bmp for size. Todd
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