I try to understand how to limit the -trim command to a specific color. For example,

The -quality option works differently for JPEG and PNG files: whereas for JPEG files it actually represents quality, and so 100 is always the best value if you’re not concerned about file size, for PNG files it represents compression method (the word “quality” as the name of the option, when we talk about processing PNGs, is misleading), and so whereas for one PNG -quality 90 will lead to a smaller file size, for another PNG it will lead to a larger file size, whereas -quality 10 may lead to a smaller one.

The -quality option works differently for JPEG and PNG files: whereas for JPEG files it actually represents quality, and so 100 is always the best value if you’re not concerned about file size, for PNG files it represents compression method (the word “quality” as the name of the option, when we talk about processing PNGs, is misleading), and so whereas for one PNG -quality 90 will lead to a smaller file size, for another PNG it will lead to a larger file size, whereas -quality 10 may lead to a smaller one.

I need to create red, green and purple (and, if possible, yellow) versions of the following image:

There are many ImageMagick filters out there, but it is not easy for me to understand which ones of them are best for which things.

Pango creates very visible edge artifacts (chromatic aberrations) compared to caption. Any way to get rid of those artifacts? Tried to change hinting for pango, but it didn’t change anything.

To strip EXIF data without losing color profile information, I use

To strip EXIF data without losing color profile information, I use

mogrify -crop 640×620+140+30 – crop -60-60 – “C:UsersxxxxDesktopIMAGE” *.jpg
I am using this command to crop the image. But it is not working. Kindly help.

I have a PNG which is assumed to be 300 PPI, but currently, because of a software bug, it is only 72 PPI. What is the correct way to fix it?