<div dir="ltr">then I suppose I'll read the dead tree book that I bought about a year earlier.</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 23, 2016 at 10:51 PM, Brian Cluff <span dir="ltr"><<a href="mailto:Brian@snaptek.com" target="_blank">Brian@snaptek.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Just keep in mind that the book on linuxtopia, grokking the gimp, is 16 years old. I'm sure there are plenty of good examples, but the gimp has changed significantly since then, so you might have to do a little searching for features that have moved.<span class="HOEnZb"><font color="#888888"><br>
<br>
Brian Cluff<br><br></font></span><div class="gmail_quote"><div><div class="h5">On March 23, 2016 7:12:40 PM MST, Michael <<a href="mailto:bmike1@gmail.com" target="_blank">bmike1@gmail.com</a>> wrote:</div></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="h5">
<div dir="ltr">I think I'll spend a day (week?) reading the Linuxtopia book.</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 23, 2016 at 4:13 PM, Brian Cluff <span dir="ltr"><<a href="mailto:brian@snaptek.com" target="_blank">brian@snaptek.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Here's some specifics of the blend modes.<br>
<a href="https://en.wikipedia.org/wiki/Blend_modes" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/Blend_modes</a><br>
<a href="http://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/gimp_guide_node55_002.html" rel="noreferrer" target="_blank">http://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/gimp_guide_node55_002.html</a><br>
<br>
For your example pictures, screen will over brighten the darker areas of your picture, so dodge produces a better result. In a different picture, screen could be the better choice.<br>
<br>
Brian<span><br>
<br>
On 03/23/2016 12:56 PM, Michael wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>
please, what is the difference between the two modes?<br>
<br>
On Wed, Mar 23, 2016 at 2:35 PM, Brian Cluff <<a href="mailto:brian@snaptek.com" target="_blank">brian@snaptek.com</a><br></span><div><div>
<mailto:<a href="mailto:brian@snaptek.com" target="_blank">brian@snaptek.com</a>>> wrote:<br>
<br>
Oops, use the Dodge layer mode instead of screen. You'll get better<br>
results.<br>
<br>
Brian<br>
<br>
<br>
On 03/23/2016 11:22 AM, Brian Cluff wrote:<br>
<br>
> On 03/23/2016 04:49 AM, Michael wrote:<br>
> Thanks Brian. I am putty in your hands!<br>
<br>
I get the bounces from the PLUG mailing list, so I got your<br>
images even<br>
though they were too big for the queue... nobody else did<br>
though, so my<br>
answer will be the only one based off your image.<br>
<br>
Anyway, looking at your pictures, it appears that the darkened edges<br>
aren't due to fading over time rather they are caused by what<br>
appear to<br>
be a flash going off that lit the center of the image more than the<br>
edges. This can also be caused of lower quality lenses giving you<br>
darkened edges in what is called a vignette.<br>
<br>
If you want to try and reduce/eliminate it, in gimp you would add a<br>
layer above your picture, but before you do that, if you have the<br>
option, go to Image -> Precision and set it to 16 ot 32 bit, so<br>
that you<br>
have more color data to work with. Unfortunately you'll only<br>
have that<br>
option if you are running the development version of GIMP, but<br>
it will<br>
still work OK if you can't do that setting. Next use the<br>
gradient tool,<br>
changing the gradient type to radial, and make a gradient that<br>
goes from<br>
black in the center fading to white at the corners. (draw the<br>
gradient<br>
from the center to one of the corners).<br>
<br>
Then set your new gradient layer's mode to "screen".<br>
<br>
At this point the effect will probably be too strong, so you<br>
will need<br>
to play with the opacity till it looks better and you can also<br>
play with<br>
the color curves moving the line on the lower left back and<br>
forth across<br>
the bottom to adjust the shape of the gradient till it better<br>
matches<br>
the vignette in your image. You can change the gradients layer mode<br>
back to normal to get an idea of what the color curve adjustment is<br>
doing to the gradient.<br>
<br>
Brian Cluff<br>
<br>
On 03/22/2016 06:42 PM, Brian Cluff wrote:<br>
<br>
Can you send an example so that I can see what you mean by<br>
"darkened<br>
around the edges"?<br>
<br>
I'll see if I can easily correct it and then send<br>
instructions on what I<br>
did.<br>
<br>
Brian Cluff<br>
<br>
On 03/22/2016 04:18 PM, Michael wrote:<br>
<br>
how does one use a transparent layer? is it only for<br>
drawing things on?<br>
I have some old pictures that have darkened around the<br>
edges. How I<br>
think I can fix it is to duplicate the layer then<br>
lighten the exposure<br>
value on the lower image, then paint black and uncover<br>
the lighter image<br>
over the section that has darkened. How do I do this<br>
with gradients and<br>
Darktable?<br>
<br>
--<br>
:-)~MIKE~(-:<br>
<br>
<br>
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