>Hello, > >I hope you can help me with this issue since I could not find an >apropriate solution so far. For my report I am not allowed to use >diagrams with colors which are not recognisable after a black/white >copy anymore, like the one attached to this message. >Since a normal greyscale of the attached plot makes blue (lowest >value) and red (highes value) looking similar. This is not an option. >I am seeking for a quick way to, let's say translate from a color >range (blue to red) to a grey scale (white to black). Since I have to >do this for several images I would appreciate a quick way, if there is >one... > >I heard that there are more than one weighting algorithms like >(R+G+B)/2 or 0,3*R+0,7*B+0,11*G and so on, but basically I would be >interested in 0*Blue + maybe 30*Green + 70*Red to achieve White as a >minimum (which is now marked with blue color) and black as a maximum >(which is now marked with red). > >Thank you in anticipation. > >Best regards.
A possibility to try. I know how it can be done. Use a Look-Up-Table (LUT) to replace one colour with another. Problem is I can not find a ready-made LUT. There is a Gimp plugin gmic-gimp-qt (note the qt version) that lets you assemble a bespoke LUT see: www.gmic.eu for download and instructions. Very tedious to set up: looks like this: https://i.imgur.com/DNM2PDK.jpg However once done, the settings can be saved. Those settings can also be incorporated into a script (attached), which runs the gmic-gimp-qt plugin. Unzip, pop in your gimp scripts folder. Find it bottom of the Filters menu along with gmic. Produces this: https://i.imgur.com/I79QxDS.jpg the plugin has lots of work to do, so be patient, it gets there. Note it is still RGB and needs converting to greyscale Image -> Mode -> Greyscale rich: www.gimp-forum.net Attachments: * http://www.gimpusers.com/system/attachments/856/original/gmic_shell.zip -- rich404 (via www.gimpusers.com/forums) _______________________________________________ gimp-user-list mailing list List address: firstname.lastname@example.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list