hi,

i usually need different size of image for different situations ( web publish, sharing with friends, etc. ). so it seems practical to complete all editing on the image before do the downscaling. quite often, i will use a utility such as ImageMagic's convert to do the downscaling and converting to other suitable formats.

but, gimp's tutorial suggests that one should do some editing tasks ( such as sharping ) after downscaling ( or upscaling ). i want to know why and how do you do that ?

what i expected workflow of image editing is:

1) improve contrast and color balance in gimp 2) despeckle
3) sharping
4) add frame/border
5) downscaling to various of sizes and convert to other formats using a script-able tool.

thanks.

-- woody

On 4/13/06, Stephen Norris wrote:

On Thu, 2006-04-13 at 13:45 +0800, steven woody wrote:

hi,

i usually need different size of image for different situations ( web publish, sharing with friends, etc. ). so it seems practical to complete all editing on the image before do the downscaling. quite often, i will use a utility such as ImageMagic's convert to do the downscaling and converting to other suitable formats.

but, gimp's tutorial suggests that one should do some editing tasks ( such as sharping ) after downscaling ( or upscaling ). i want to know why and how do you do that ?

what i expected workflow of image editing is:

1) improve contrast and color balance in gimp 2) despeckle
3) sharping
4) add frame/border
5) downscaling to various of sizes and convert to other formats using a script-able tool.

thanks.

Sharpening after downsampling is normal - the downsampling operation makes the image more fuzzy as a natural consequence, so you generally have to sharpen afterwards.

ok. then how about despeckle? can i do despeckle before

Since you need to do that, there's no point sharpening beforehand as well.

i need sharpening beforehand is because the image is scanned out from film scanner, the result is a little soft comparing to original.

Stephen

--
woody