Before I realized it, Photoshop had changed myģ00ppi file to 72ppi and halved the file size. All I did was do some color adjust and saved I have just edited some photos that are 3000x2000 (6MP) and 300ppi It has no bearing on image quality - only the number of pixels determine quality. So don't get hung up or fixated on what the dpi value is. You can change dpi value to any number you like - without affecting pixels or quality of your image - by doing "Image / Image size." command WITHOUT checkmark next to "resample image" box, in other wortds, with NO RESAMPLING. The dpi setting only specifies how big each of those pixels gets printed. If you save a file with 300 or 3000 dpi, when you read this file back it will appear to have dpi value of 72.īut in any case, the important thing is the number of pixels in the image - and that of course will not change by being saved and then read back, no matter what format you use. GIF file format, however, does not do this. If you save a file with a certain dpu value, that value will be read back when you open the same file later. You cropped or resampled the image, perhaps inadvertently, - or you saved it as a GIF and then read it back - and that set dpi to 72.ĭpi value is saved or retained in TIF, JPEG, BMP, or TIF files. Shouldn't Photoshop try to maintain the original ppi as well as the resolution? Also when I try to change the ppi back to 300 it either blows the file to 300MB or reduces the print size to 10"圆" but maintains the resolution. What I don't understand however is why the photo starts at 2.5MB and 300ppi and even if all I do is open in Photoshop and save it becomes 1.1MB and 72ppi.
It wasn't until I went back and looked at the properties that I realized that Photoshop had adjusted the file.Ĭan someone tell me why it does this? Can I stop it from "downsizing" my files? Am I right in believing that this has an impact on the apparent grain on the printed image? When I printed this file I noticed that it appeared grainy. Before I realized it, Photoshop had changed my 300ppi file to 72ppi and halved the file size. All I did was do some color adjust and saved the file again. I have just edited some photos that are 3000x2000 (6MP) and 300ppi out of the camera.
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