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Resize png 8 bits
Posted: Sat May 14, 2022 6:12 am
by den1a
Hello. I want to crop the photo, but I get a poor quality photo. Please tell me how to fix the problem
Code: Select all
nconvert -overwrite -resize 1500 1200 -ratio -rflag decr image.png
Re: Resize png 8 bits
Posted: Mon May 16, 2022 5:25 pm
by 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
to specify the output file format (png) and the compression level.
Code: Select all
-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.
Re: Resize png 8 bits
Posted: Mon May 16, 2022 6:45 pm
by 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.
Re: Resize png 8 bits
Posted: Tue May 17, 2022 5:08 am
by den1a
In my case, the problem was solved by adding a parameter
-rtype quick
Code: Select all
nconvert -overwrite -resize 1500 1200 -ratio -rflag decr -rtype quick image.png
Re: Resize png 8 bits
Posted: Tue May 17, 2022 5:45 am
by cday
den1a wrote: Tue May 17, 2022 5:08 am
In my case, the problem was solved by adding a parameter
-rtype quick
Code: Select all
nconvert -overwrite -resize 1500 1200 -ratio -rflag decr -rtype quick image.png
Interesting...
Code: Select all
-rtype : Type of resampling
quick : Quick resize
linear : Bi-linear (linear)
hermite : Hermite
gaussian : Gaussian
bell : Bell
bspline : Bspline
mitchell : Mitchell
lanczos : Lanczos
Re: Resize png 8 bits
Posted: Tue May 17, 2022 5:54 am
by den1a
Unusual, but it works
Thank you for responding!