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Confused by the contrast tool

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Confused by the contrast tool Stephane Chauveau 20 Feb 22:43
  Confused by the contrast tool Tomas Mraz 21 Feb 08:58
Stephane Chauveau
2006-02-20 22:43:20 UTC (about 18 years ago)

Confused by the contrast tool

Hi,

Last W-E, I discovered that the Value Curve is in fact applied independantly to each of the R, G & B channels. Pretty useless since using a non-linear Value Curve is going to change the HUE channel.

Today, I experimented with different tools and I found that the Contrast tool has a very unusual behavior. I tried different tools (Krita, OpenOffice, Cinepaint) and they all handle the contrast the same way. Basically, reducing the contrast is like adding a grey mask to the image.
The Contrast tool in gimp is very different. This is the original image:

http://www.chauveau-central.net/colors.png

This is what Cinepaint produces when I reduce the contrast. So far so good:

http://www.chauveau-central.net/colors-cinepaint.png

And this is what I get with Gimp:

http://www.chauveau-central.net/colors-gimp.png

What do you think?
Stephane.

Tomas Mraz
2006-02-21 08:58:04 UTC (about 18 years ago)

Confused by the contrast tool

On Mon, 2006-02-20 at 22:43 +0100, Stephane Chauveau wrote:

http://www.chauveau-central.net/colors-gimp.png

What do you think?

To me it seems like a bug. Could you enter it to bugzilla, please?