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Eyedropper tool in for instance Color to Alpha Dialogue

Nov 26, 2013, 19:28
Post: #1
Eyedropper tool in for instance Color to Alpha Dialogue
I'm on MacOS 10.9 (Mavericks). Using GIMP 2.8.8 (lisanet edition).
GIMP has been installed for many years on my computers, but first since it runs natively (without x11 or xQuartz) have I finally and entirely switched to GIMP for my raster graphic work.

I really like GIMP and I'm working on expanding my knowledge and respect this excellent programme very much. There are of course a couple of oddities when you are used to Photoshop (until 3 months ago). I'm getting there. Though one issue sticks out:

The use of the eyedropper tool for example in the Color to Alpha Dialogue. First of all I'm aware about the difference between the Color Picker (set colour from image pixels) in the toolbox and the eyedropper. I'm writing here about the latter. It simply doesn't work at all. When I open Color to Alpha... and then click on the color field (by default it's white #ffffff) the Color to Alpha Color Picker opens. When I select here the Eyedropper tool (Click the eyedropper, then select a color anywhere on your screen to select that color.) the following scenario happens: the cursor doesn't indicate a particular function (stays as standard pointer) - when clicking anywhere on my screen both dialogues, Color to Alpha and Color to Alpha Color Picker disappear (respectively they slip behind the main GIMP interface). I can't select any color! And when I manage to get the two dialogue windows back into focus, I have to wait a certain amount of time before any pressing of OK or Cancel shows any response.

Sometimes a random color gets selected but this is beyond my influence.

I guess it's a weak spot of the new native GIMP without any X11 wrapping. The windows managements has several weaknesses (i.e. GIMP/Hide). I also thought that it might be caused by the Single-Window Mode. But even without that the problem remains. All in all it's a very important function and without it the workflow involved gets very tiresome. I've read several forum posts somewhat touching this issue, though none of the replies really explained what's going wrong here. Will this be amended in some future release? Thanks for your patience and reaching this point.
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Nov 27, 2013, 09:48 (This post was last modified: Nov 27, 2013 09:49 by iForStyle007.)
Post: #2
RE: Eyedropper tool in for instance Color to Alpha Dialogue
Or maybe its you're clicking the eyedropper on the wrong part of the screen. I thought the same too at first.

After you open color to alpha. Click the color rectangle to open up the color selector (on the color to alpha window.)

Then click the eyedropper. Then click on the *Preview* image on the color to alpha window, to select the color, it doesn't work if you click on the canvas.

This maybe your problem (hopes!) Get back at me if its not & someone else will if haven't already reply to your issue Smile

"In order to succeed, your desire for success should be greater than fear of failure." BC
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Nov 27, 2013, 11:43
Post: #3
RE: Eyedropper tool in for instance Color to Alpha Dialogue
(Nov 27, 2013 09:48)iForStyle007 Wrote:  Then click the eyedropper. Then click on the *Preview* image on the color to alpha window, to select the color, it doesn't work if you click on the canvas.

Nope, that doesn't work neither. Same problem. And - it says: Click anywhere on your screen (not: Click on the Preview Window).

Thanks for the reply anyway.
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Nov 27, 2013, 13:01
Post: #4
RE: Eyedropper tool in for instance Color to Alpha Dialogue
(Nov 27, 2013 11:43)kdmeloper Wrote:  
(Nov 27, 2013 09:48)iForStyle007 Wrote:  Then click the eyedropper. Then click on the *Preview* image on the color to alpha window, to select the color, it doesn't work if you click on the canvas.

Nope, that doesn't work neither. Same problem. And - it says: Click anywhere on your screen (not: Click on the Preview Window).

Thanks for the reply anyway.

anytime,

So upon further research I found this post, confirmed its a Gimp on mac problem, possible solution in this post:
http://blenderartists.org/forum/showthre...ost1290754

If that doesn't work,
I thought of two other things to try before I found the above, while your waiting for others.

1. Do you have the correct layer selected or a background under that layer to show through? Is anything selected before you "Color to alpha" ? Clear any selections.
"Select > None..."

2. You can get a live preview of the color change by clicking the eyedropper in the color picker and click-hold drag it around the Preview window. I know it says "the whole screen" in the alt text, but its misleading as when you click any part of the screen outside of the "color to alpha" window, you'll either edit the canvas with the current selected toolbox tool, or accidentally close the "color to alpha" window.

This is my last post for today so If no-one gets back, I'll get back to you tomorrow or later.
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Nov 27, 2013, 23:29
Post: #5
RE: Eyedropper tool in for instance Color to Alpha Dialogue
Just to finish this off, for now. I've tried all suggestions here but nothing works. I have to conclude that there is a function in GIMP, which is promising and would be very helpful but it simply doesn't do what one expects. It is a dead end - a null function.
This is of course very disappointing. And I ask myself for what is this Eyedropper button for? What I will do in such a situation, and I knew it all the time, is to use the Color Picker (1), select the particular foreground color I'm after (2), then open the Change Foreground Color dialogue (3), copy the HTML notation to the clipboard memory (4) (funny enough on a Mac with Ctrl-c and not Cmd-c), then open the Color to Alpha dialogue (5) and past the clipboard content into the Color to Alpha Color Picker HTML notation field (6). These are an awful lot of steps of a workflow which would be wonderfully simplified if then the eyedropper function would be working. But this seems to be just a dream.
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Dec 16, 2013, 05:26
Post: #6
RE: Eyedropper tool in for instance Color to Alpha Dialogue
Hey guys, this has been driving me bonkers as well but I found a funny workaround:

1. Choose the eyedropper in the color dialog or what-have-you.
2. Option-Tab to another program (seriously)
3. Option-Tab back into GIMP (i kid you not)
4. The eyedrop tool is now active although it doesn't always display the tiny eyedrop cursor

For what it's worth, I'm running OSX 10.8.4 and GIMP 2.8.10...

Also, I'm used to pixel editing on ASEprite -- is there anyway to set up the UI so the color I'm currently hovering over is displayed somewhere? That's super useful for me when I eyedrop.
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Dec 16, 2013, 13:03
Post: #7
RE: Eyedropper tool in for instance Color to Alpha Dialogue
It's funny how many funny workarounds appear here on this issue. The 'racarate' workaround from above with Option-Tabbing to another programme and reverse (always consider this is a MacOS X scenario) doesn't work for me. Somehow it produces a funny result: Once back in GIMP I have to Option-Tab back into the Color-To-Alpha/Color Picker dialog (because I'm in Single-Window Mode and this dialog disappeared behind the main GIMP window) and there I clicked (in this particular case) a brownish color in my open image file (the correct layer selected), nothing happened, but when I then clicked the eyedropper again, a blue color got selected. From where this blue color comes from - no idea. So it works somehow, for the heck of it I can't influence the selected color, though.
It would be really good if the responsible programmer(s) would produce a video cast and demonstrate how the heck this is supposed to work.
For my part I found another workaround. A lame one I admit but nevertheless it works. I use the Color Picker Tool from the Toolbox, select the desired color and then open the Color-To-Alpha dialog. There I click the From color field with the right mouse button and in the context menu I select Foreground Color. That works, although it is not so direct and interactive as I would wish.
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Dec 17, 2013, 08:49
Post: #8
RE: Eyedropper tool in for instance Color to Alpha Dialogue
Lol sorry if it seems like you're getting a run around but sometimes you gotta workaround until there is an update or fix in WHICH YOU ARE MAYBE IN LUCK ^_^

There's another thread about maverick issues and they've linked a newer version of gimp

Gimp mac 2.8.10
http://gimpforums.com/thread-gimp-silly-...2#pid23792

Here are other mac versions to try if that doesn't fix it:
http://gimpforums.com/thread-gimp-silly-...1#pid22741
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