[Gimp-user] Masking for Contrast Control - Can this be done in Gimp?

[Alec Burgess]

Saul:
You said
> 1. Drag your original layer over to the Channels Dialog and drop it,  
> creating a new channel.
In your video, when you drag the image from the layer dock up to the 
channels dock your cursor has a '+' sign inside the
 _
|+ ... when I do it I have no plus sign and when the channels dock opens 
and I drop the dragged item just disappears without raising a new channel.

I'm using 2.6.6 on Windows XP. I tried modifier keys Shift and Ctrl and 
Shift+Ctrl just in case but can't get the '+' sign to appear in the 
cursor and more importantly can't get the auto-creation of a new channel.

Is this a bug or is there something I'm missing?

saulgoode at flashingtwelve.brickfilms.com wrote:
> Quoting paperaussie <paperaussie at gmx.net>:
>
>   
>> Can any experienced Gimp users tell me how the process described in Ron
>> Bigelow's article can be reproduced in Gimp most efficiently?
>>
>> http://www.ronbigelow.com/articles/contrast/contrast.htm
>>     
>
> The following link is to a short screen capture of how that might be  
> done in GIMP I use a similar technique quite often when adjusting  
> highlights and shadows. There is no sound but the video should be easy  
> to follow (I apologize for the jumpy pointer; my optical mouse died  
> and I had to use a trackball).
>
> http://flashingtwelve.brickfilms.com/GIMP/Temp/masking.ogv (OGG Theora 2.7Mb)
>
> 1. Drag your original layer over to the Channels Dialog and drop it,  
> creating a new channel.
> 2. Hide the channel by clicking on its "eyeball" icon.
> 3. Return to the Layers Dialog.
> 4. Duplicate your original layer and increase its gamma using the  
> Levels filter.
> 5. Add a layermask to the duplicate layer, initializing it to the  
> inverted channel produced by Step 1.
> 6. Add a bit of Gaussian blur to the layermask (optional).
> 7. Adjust the opacity of the duplicate layer to obtain desired result.
>
> Step 4 is not necessary if you already have an "overexposed" version  
> of the original layer (created from a HDR RAW file), as was the case  
> in the tutorial you linked to.
>
>
>
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>
>   

-- 
Regards ... Alec   (buralex at gmail & WinLiveMess - alec.m.burgess at skype)

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