I need a 50×50 mm, 600×600 pixel (digital) picture for my passport. What the hell does that mean? If I’m looking at it on my pc I can make it 50×50. But if I open it in my phone it’ll be 5×5, if I open it in a bigger monitor it’ll be 100×100. How do I know what display they’ll be looking at it on?
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Honestly, this is just a bad misunderstanding from the people who set the requirements.
For *digital* pictures, all that matters is the pixel size (in your example, 600×600). A 600×600 pixel image can be “resized” to basically *any* physical size in the 1:1 aspect ratio, and it’s the exact same image. There is no good reason for them to tell you that your digital image needs to have any specific size in mm.
That said, digital images *may* have a “flag” in them that sets a physical size, such as “pixels per inch” in the US or “pixels per cm” in metric countries.
It sounds like they *want* a 600×600 pixel image that is set to be 50x50mm, because it is flagged to print at 120pixels/cm. If you open the image in Photoshop (or similar), you can “resize” the image to 50x50mm, without changing the 600×600 pixels. Then send it off to the passport authority, and just be mad at them for setting a stupid requirement.
EDIT: And if it’s actually *you* who has misunderstood the requirements, and you are really submitting a 50x50mm *printed* picture (that you will print from a digital image), then the requirement just means “please make sure that the 50x50mm printed picture came from an image that was *at least* 600×600 pixels. In other words, if you take, say, a group photo in which your face is just a tiny speck, then try to crop your face out, you will likely land up with less than the required number of pixels, and your picture will be rejected as too blurry/grainy.
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