Resizing/shrinking .JPG files without losing quality?


Im using Gimp to resize images. When using a high res image normally 4500 x 2994 i usually need to shrink this image to 325 x 130 pixels.

As you can imagine i loose the shiny, glossy and high res quality oof the image. Ive tried to save the image as .bmp and then resize it, this has made a slight difference but not a considerable change.

What else can i do to ensure i retain the hi-res quality of the image?

Thanks to anyone who helps.

11/29/2013 9:28:00 AM

I found that the from and to formats are incommensurable, that means you add a lot of extra-noise to the JPG noise:

  • 2994 = 2 * 3 * 499
  • 4500 = 22 * 32 * 53

You may have better results when scaling by common factors, in this case 6:

  • 4500/6 = 750
  • 2994/6 = 499

I'd try a tool that is specialized for this kind of work, maybe ImageMagick will help you. This tool is aware of the JPG specificity and has options to control the output. If I'm right, Wikipedia uses it under the hood.

11/29/2013 11:36:00 AM