Gérard de Lux Posted March 3, 2012 Report Share Posted March 3, 2012 In the attached slideshow, there are 6 identical slides, size 1800x1200 px. They come from an original jpeg picture at 5616x3744 px. One of these is the original put straight into PTE, without prior downsizing. The 5 other have been reduced in Photoshop at 1800x1200 px with compression ratios ranging from 100/100 to 30/100 (values of "Save for the Web" function). The resulting image file weights are: 12.8 MB, 1,5 MB, 270 KB, 194 KB, 152 KB and 125 KB.Of course, the images are not shown in a logical order - it wouldn't be fun ! as the game is to find the 'quality' (or compression ratio) in decreasing order. Here's the test exe file.Gérard,I went thru the 6 images a couple of times and on my 24 inch computer screen I could not see a difference. If I had to pick the one that was not reduced I would say number 3. Maybe if I saw them on my 42 Inch LCD TV, it would be different. I make my jpeg's for PTE from my Tiff images with "FastStone Photo Resizer" on setting 80.BertHello Bert,Apparently, you've been the only one to dare look at this test, although I do think that it's very interesting as it gives concrete answers to many of the questions here!Anyway, here's the solution:This is the order of the 6 pictures...quality (compression ratio in 'Save for the Web' of Photoshop CS5): 50 - 60 - 100 - original - 30 - 40or as they appear in PTE: Link to comment Share on other sites More sharing options...
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