? about Gimp smart sharpening.

[PrimeTime]

I was trying to follow this tutorial for gimp on smart sharpening http://www.gimp.org/tutorials/Smart_Sharpening/

I says to start by duplicating the image....right click and select image>mode>decompose

When i do that , there is no decompose to choose...............Am i doing something wrong??

I have the newer program downloaded, is there something different i need to choose to get to the same point?

Any help will be most appreciated. Thank's

[dcclark]

PrimeTime, that looks like an older tutorial (it's copyright 2002). The command you're looking for is now in Color -> Channels -> Decompose.

Have fun!

[PrimeTime]

Originally Posted by dcclark

PrimeTime, that looks like an older tutorial (it's copyright 2002). The command you're looking for is now in Color -> Channels -> Decompose.

Have fun!

Thank's alot! Is the rest of it the same?

[wulf]

Try DIY High Pass Filtering instead. Less steps and I think the result is equal to or better than the smart sharpening idea.

Wulf

[PrimeTime]

Originally Posted by wulf

Try DIY High Pass Filtering instead. Less steps and I think the result is equal to or better than the smart sharpening idea.

Wulf

Thank's wulf..........i'll give it a try.

[sfisher]

The actual sharpening routine wasn't the only interesting part of that article. The principle of decomposing an RGB image to LAB and sharpening just the 'L' channel is a good one, as it avoids colour shifts in the sharpened image. However, the current limitation in GIMP to 8-bits per channel causes quantisation errors during the RGB->LAB conversion (and also in the LAB->RGB conversion), so be careful with it. When full 16-bit support arrives in GIMP, I'll probably start using this approach again.