New answers tagged photography
You can't actually increase the resolution of an image once you have it, unless the photographer has a higher quality file that you can go back to. I would suggest getting RAW files if you reshoot because they are lossless/ not compressed by the camera.
If there is a luxury of possibility to re-shoot, I would ask your photographer to re-shoot at the highest possible megapixel that your photographer's camera allow. In this case I would suggest min of 18megapixel setting. and printing your image at atleast 150dpi. This should look still good from close distance. Other option is to use 3rd party plugins for ...
This seems like a simple matter of a two step workflow. Crop all images to allow the same amount of white space around the product. Resize the images after the crop so they are all the same size. That should get all the images the same. (These are smaller because I only had your 250x250 images to work with)
Set some standards based on the limitations of the images you're working with As discussed in the comments on Scott's answer, a good option is to choose your smallest image, enlarge it as much as possible without visible quality degradation, and then use the same amount of white-space available in that image as the benchmark for all other images. Set a ...
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