by Jakub

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JPEG issues aside, downsizing images will result in a loss of sharpness. Furthermore, printing will result in a loss of sharpness too - the extent of this depending on the particular medium you are using. This is what output sharpening is used to counteract. You can read an explanation of output sharpening for web and print in this article, which has some ...


This is a partial answer. For a 36"x24" poster it is ok the 5400 x 3600 px size. You have a 150 ppi file which is good. Probably you can go to 200 ppi (7200 x 4800px), but the diference is not very noticable, using a magnifier inclusive. In my opinion you don't need 300 ppi at all. The main point for thoose resolutions are the printer resolution and ...


I have found the free waifu2x very good for upsizing images. You can try an online demo. It uses "Deep Convolutional Neural Networks" to predict what the missing image data should be. It works better for line art, but is definitely acceptable for photos.


Yes; if you edit the image (for example, to resize) and save, there will be new degradation from JPEG artifacts. If you saved (and resave) at a very high JPEG quality, the difference will be negligible. You could avoid this by saving in a lossless format like TIFF instead after your edit.


The column of the table you refer to is titled "Capacity/litre of working strength fixer" so each 1L will process 80 sheets of 20.3x25.4cm paper and 10L will, therefore, process 800 sheets of 20.3x25.4cm paper, etc.

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