I looked at the wikipedia.... very informative! On Wed, Mar 23, 2016 at 4:13 PM, Brian Cluff wrote: > Here's some specifics of the blend modes. > https://en.wikipedia.org/wiki/Blend_modes > > http://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/gimp_guide_node55_002.html > > 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. > > Brian > > On 03/23/2016 12:56 PM, Michael wrote: > >> please, what is the difference between the two modes? >> >> On Wed, Mar 23, 2016 at 2:35 PM, Brian Cluff > > wrote: >> >> 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~(-: >> >> >> --------------------------------------------------- >> PLUG-discuss mailing list - >> PLUG-discuss@lists.phxlinux.org >> >> To subscribe, unsubscribe, or to change your mail >> settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> >> >> >> -- >> :-)~MIKE~(-: >> >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss > -- :-)~MIKE~(-: