Situation: start Gimp .png with brightness/contrast options as one-liner in terminal
Motivation: have a plane of brightness-contrast where you can control them on x-axis and y-axis; synonym non-linear plane of brightness-contrast, ... (see here for its expected output at the end of the question body)
Pseudocode to get the mode Colours > Curves
gimp --contrast --brightness file.png
Related issue simply starting Gimp in Ubuntu 16.04
Related bug: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1576977. I do
gimp file.png
Output in Terminal
(gimp:4270): GLib-GObject-WARNING **: g_object_set_valist: object class 'GeglConfig' has no property named 'cache-size'
(gimp:4270): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x1A523C0 from "gimp:point-layer-mode" to "gimp:dissolve-mode"
(gimp:4270): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x1A52890 from "gimp:point-layer-mode" to "gimp:behind-mode"
...
(gimp:4270): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x1A58390 from "gimp:point-layer-mode" to "gimp:color-erase-mode"
(gimp:4270): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x1A58730 from "gimp:point-layer-mode" to "gimp:erase-mode"
(gimp:4270): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x1A58B90 from "gimp:point-layer-mode" to "gimp:replace-mode"
System: Linux Ubuntu 16.04 64 bit
Hardware: Macbook Air 2013-mid
Gimp: 2.8.16
Related: To Adjust Brightness-Contrast in Plane with Gimp/ImageMagick/…? for Debian and Ubuntu
