Resize png 8 bits

[den1a]

Hello. I want to crop the photo, but I get a poor quality photo. Please tell me how to fix the problem

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nconvert -overwrite -resize 1500 1200 -ratio -rflag decr image.png

[JeanMich]

Hello,
I don't quite get it : you are not cropping anything here.

Whatever, I'm no expert but I'd try to add

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-out png -clevel 9  

to specify the output file format (png) and the compression level.

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 -overwrite -out png -clevel 9  -ratio -resize 1500 1200 -rflag decr 

It's giving me an image with the correct colors.
If you have different images from different sources, I'd add also something to deal with transparency, alpha chanel, metadata and so on to make smaller files.

[cday]

The GUI software XnConvert, with it's Actions Preview, can provide an easy way to test different settings, but testing with 1.95 I haven't managed to obtain the desired result, no breakup of the image though.

[den1a]

In my case, the problem was solved by adding a parameter -rtype quick

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nconvert -overwrite -resize 1500 1200 -ratio -rflag decr -rtype quick image.png

[cday]

In my case, the problem was solved by adding a parameter -rtype quick

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nconvert -overwrite -resize 1500 1200 -ratio -rflag decr -rtype quick image.png

Interesting...

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-rtype        : Type of resampling
          quick    : Quick resize
          linear   : Bi-linear (linear)
          hermite  : Hermite
          gaussian : Gaussian
          bell     : Bell
          bspline  : Bspline
          mitchell : Mitchell
          lanczos  : Lanczos

[den1a]

Unusual, but it works
Thank you for responding!