Akkana Peck wrote:
> Helen writes:
>>I have a photo of a dark red flower against a dark background.
>>I've tried tedious ways to lighten the background without changing the
>>but the details of the flower are too tiny. So I'm browsing tutorials.
>>Should I
>>be learning about masks? About layers? A hint how I can approach this?
> Selection is what you need to be learning about: you need to
> selecting the flower and not the background, or vice versa,
> so that you can run a lightening tool (brightness-contrast, levels,
> or curves) on the background without affecting the flower.
> There are lots of ways of selecting: you could use paths then turn
> the path into a selection, or you could use select by color or
> intelligent scissors to make an approximate selection, then use the
> quick mask to fine tune it and get it perfect.
> For any of these techniques (maybe not siox), zoom in a lot so you
> can see what you're doing and make sure you get all the fine
> details. That's why these tools are better than something like
> Lasso select that doesn't let you zoom in.
> If you can run the development version of GIMP (2.3), the new siox
> tool works quite well for flowers against a contrasting background.
> A couple other tips: you'll probably want a few pixels of feathering
> (but you can feather a selection after the fact, from the Select
> menu), and you'll want to use View->Toggle Selection (ctrl-T) a lot
> to turn off the selection boundary while you're adjusting the
> brightness of the background, to make sure you don't get an obvious
> looking jump at the selection boundary (if you do, try feathering more).

I agree with everything here except I'd use a mask instead of a
selection.  A selection can be a bit too fleeting for a something as
tedious as your task.

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