Rasterizing an existing image to lower ppi

Question

I don’t know if this is even possible to calculate somehow, but maybe someone can help. If i have a 200ppi image in a file, and i want it to keep the size, but have 150 ppi, is there a way to calculate what ppi i have to use for rasterizing? I am aware that rasterizing an image from 200 ppi to 150 ppi will not give out the same result as rasterizing a vector object to 150 ppi.

Again, for example

Vector object > rasterize 150 ppi > object with certain “pixel density”
200 ppi image > rasterise ? ppi > object with same pixel density as option 1 (150 ppi) < is this even possible?

Ton Frederiks · Accepted Answer

I understood that you were talking about images and yes, lowering the resolution gives a lower quality.

Of course rasterizing a vector will make it an image and lose all the advantages of a scalable vector object.

Ton Frederiks · Answer

​@martink15467522You can select an image, select Crop andset the PPI in the Control panel and hit enter

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