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When I go to export my file in Photoshop, the file size become much larger than what I first created the file to be. I will make a 4x6 file, and then it will export to 16x24. I changed the PPI to 72 as I saw some recommending that but then my file becomes blurry and grainy. How can I stop photoshop from doing this and export my file to the size I orginially created it to be?
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Photoshop doesn't work with sizes. It works with pixels only. All you need to worry about is how many pixels wide by how many pixels high.
Size is a secondary, derived unit, resulting from whatever pixels per inch-number you assign to the file. Pixels per inch is a measure of pixel density on paper.
Export is for screen/web/mobile devices. Ppi is a print parameter, it does not apply on screen/web. So Export strips the ppi number altogether. An exported file does not have a ppi, and therefore it does not have a size.
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I understand that but when I create my file as the pixels for a 4x6, it changes pixel size when I go to export the file and I can't figure out how to make that stop.
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Be specific. How many pixels? How many pixels in the exported file?