jpeg image compression

[sudhasri]

Is there any command to make the jpeg image compressed without changing the quality and resolution of the image...

[snibgo]

Jpeg files are always compressed. And they always lose quality (the pixels change) every time IM writes them. (Well, they almost always lose quality.)

Lower "-quality" settings give greater compression but more data loss. "-quality 100" gives least compression and least data loss.

Does that answer the question?

[sudhasri]

Thanks ,

yea am using the same command
convert original.jpeg -quality 60 imagemagick_60.jpg but there is slight difference in quality compared to the original image.. Is there any alternate way to that..

[snibgo]

The best alternative is: don't use jpegs.

If the images are graphics with solid colours, png may give you better compression with no data loss.