Re: darkening around the edges

>>>     Oops, use the Dodge layer mode instead of screen.  You'll get
>better
>>>     results.

>>>     Brian

>>>     On 03/23/2016 11:22 AM, Brian Cluff wrote:

>>>           > On 03/23/2016 04:49 AM, Michael wrote:
>>>           > Thanks Brian. I am putty in your hands!

>>>         I get the bounces from the PLUG mailing list, so I got your
>>>         images even
>>>         though they were too big for the queue... nobody else did
>>>         though, so my
>>>         answer will be the only one based off your image.

>>>         Anyway, looking at your pictures, it appears that the
>darkened
>>> edges
>>>         aren't due to fading over time rather they are caused by
>what
>>>         appear to
>>>         be a flash going off that lit the center of the image more
>than
>>> the
>>>         edges. This can also be caused of lower quality lenses
>giving you
>>>         darkened edges in what is called a vignette.

>>>         If you want to try and reduce/eliminate it, in gimp you
>would add
>>> a
>>>         layer above your picture, but before you do that, if you
>have the
>>>         option, go to Image -> Precision and set it to 16 ot 32 bit,
>so
>>>         that you
>>>         have more color data to work with.  Unfortunately you'll
>only
>>>         have that
>>>         option if you are running the development version of GIMP,
>but
>>>         it will
>>>         still work OK if you can't do that setting. Next use the
>>>         gradient tool,
>>>         changing the gradient type to radial, and make a gradient
>that
>>>         goes from
>>>         black in the center fading to white at the corners. (draw
>the
>>>         gradient
>>>         from the center to one of the corners).

>>>         Then set your new gradient layer's mode to "screen".

>>>         At this point the effect will probably be too strong, so you
>>>         will need
>>>         to play with the opacity till it looks better and you can
>also
>>>         play with
>>>         the color curves moving the line on the lower left back and
>>>         forth across
>>>         the bottom to adjust the shape of the gradient till it
>better
>>>         matches
>>>         the vignette in your image.  You can change the gradients
>layer
>>> mode
>>>         back to normal to get an idea of what the color curve
>adjustment
>>> is
>>>         doing to the gradient.

>>>         Brian Cluff

>>>         On 03/22/2016 06:42 PM, Brian Cluff wrote:

>>>             Can you send an example so that I can see what you mean
>by
>>>             "darkened
>>>             around the edges"?

>>>             I'll see if I can easily correct it and then send
>>>             instructions on what I
>>>             did.

>>>             Brian Cluff

>>>             On 03/22/2016 04:18 PM, Michael wrote:

>>>                 how does one use a transparent layer? is it only for
>>>                 drawing things on?
>>>                 I have some old pictures that have darkened around
>the
>>>                 edges. How I
>>>                 think I can fix it is to duplicate the layer then
>>>                 lighten the exposure
>>>                 value on the lower image, then paint black and
>uncover
>>>                 the lighter image
>>>                 over the section that has darkened. How do I do this
>>>                 with gradients and
>>>                 Darktable?

>>>                 --
>>>                 :-)~MIKE~(-:

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