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I can't argue with you logic, but I'm loving the results! I downloaded a roughly 1500 x 800 image which shows up in Photoshop as having 300 dpi. Size alone, unusable for full screen HD motion graphics. I then changed the size to about 3840 x 2160 and saved the image. When I reopened the image it was the larger size and as razor sharp and finely detailed as the original image! No loss of quality at all. For a comparison, I went back to the same site and found another roughly 1,500 x 800 image but this one showed up in PS as having only 72 ppi. I tried resizing that to the larger 3840 x 2160, and it totally fell apart as you would expect. So for me, PPI most certainly IS relevant. Bottom line, it may not make sense but it's working fabulously for me! Thanks again for your original tip. Pete ------------------------------------------------------------------------------------------------------------------------ No - you can’t blow up a 300 ppi image 4 times without loosing quality in video or the web. The samples I showed you are exactly the same number of pixels. The PPI only effects the size of the printed image on paper. They will both look exactly the same on the web, embedded in an email, or in a video. PPI is completely irrelevant unless you are printing. That is what controls the size of the printed image. If you are scanning a document then increasing the PPI will give you more pixels per inch of document, but if the image originally is 100 pixels by 100 pixels then the resolution is 10,000 pixels. PPI has nothing at all to do with resolution in a digital image. PPI has everything to do with resolution when you are talking about scanning or the size of an image sensor. When you are talking about a digital display you don’t use PPI, you use dot pitch - how many dots are there per inch. I hope this helps. When working with images in Photoshop or even creating vector artwork in Illustrator you should only be looking at the number of pixels. The only time you need to pay attention to PPI is when you intend to print that image on paper. Hope this clears it up for you. |
