png convert again in irfanview get smaller size!
Posted: 2010-10-10T03:45:25-07:00
Hello!
Converts a jpg image (big size) to a PNG image (120x120 pixels) with the following windows command: (it work's)
The size of the Image c:\temp\thumb.png is 19500 byte.
If I convert the image again with IrfanView (following command)
The new size is only 1820byte
Why? (I can´t se the differences in the images)
What information has been lost?
Can I do the same thing, but only in ImageMagick (with the same result)?
//Jan
Converts a jpg image (big size) to a PNG image (120x120 pixels) with the following windows command:
Code: Select all
convert -define jpeg:size=120x120 c:\temp\pic\4613100.jpg -thumbnail 120x120^^ -gravity center -extent 120x120 c:\temp\thumb.pngThe size of the Image c:\temp\thumb.png is 19500 byte.
If I convert the image again with IrfanView (following command)
Code: Select all
i_view32 c:\temp\thumb.png /convert=c:\temp\thumb1.pngWhy? (I can´t se the differences in the images)
What information has been lost?
Can I do the same thing, but only in ImageMagick (with the same result)?
//Jan