Std conversion of image file type creates files much much larger

dec · Post by **dec** » Sun Aug 07, 2022 4:33 am

converting JPG to PNG is creating files massively larger eg 1mb > 7mb

Post by **xnview** » Sun Aug 07, 2022 7:12 am

It's normal, JPEG is lossy format, and PNG is lossless format

dec · Post by **dec** » Sun Aug 07, 2022 9:42 am

this is not my experience with conversions with other graphics programs

Post by **xnview** » Tue Aug 09, 2022 6:54 am

could you post the ouput from XnView and from other app?

dec · Post by **dec** » Tue Aug 09, 2022 1:22 pm

difficult because i do not want to upload 10mb files

cday · Post by **cday** » Tue Aug 09, 2022 1:52 pm

You could possibly post screenshots of the viewer File > Properties... display for a JPEG, and for the same file converted to PNG by XnView MP, and if possible another software that you say produces smaller output sizes...

You might also look at the PNG save compression level set, the default values is 6 and I don't think increasing the value to the maximum of 9 reduces the filesize very much.

I believe without checking that the PNG format supports alternative compression methods, and that the content of the image being saved may also significantly affect the size of the output file, with areas of uniform colour possibly compressing very well.

dec · Post by **dec** » Tue Aug 09, 2022 3:40 pm

thank you.
will check some things.

XnView Software

Std conversion of image file type creates files much much larger

Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger

Re: Std conversion of image file type creates files much much larger