then I suppose I'll read the dead tree book that I bought about a year earlier. On Wed, Mar 23, 2016 at 10:51 PM, Brian Cluff wrote: > 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. > > Brian Cluff > > On March 23, 2016 7:12:40 PM MST, Michael wrote: > >> I think I'll spend a day (week?) reading the Linuxtopia book. >> >> 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~(-: >> >> ------------------------------ >> >> 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~(-: