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[GIMP] Tips & Tricks

Just as the name says, here is where you can post tips and tricks to share with other users of MEPIS.
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k_sz
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[GIMP] Tips & Tricks

#1 Post by k_sz » Tue Mar 13, 2018 12:32 pm

Here could we share our knowledge about manipulating images using The Gimp.
Below this paragraph, i'll list the tips that'll be posted in the thread or in another forum, with direct links to the concerned post. Here you'll find links to modifiable resources you could use In Gimp to customize parts of your desktop :
Last edited by k_sz on Tue Mar 13, 2018 3:01 pm, edited 3 times in total.
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cyrilus31
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#2 Post by cyrilus31 » Tue Mar 13, 2018 12:52 pm

Bon tuto. Merci!

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k_sz
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#3 Post by k_sz » Tue Mar 13, 2018 1:04 pm

About hiding layers and colorizing areas (precisely)
asqwerth wrote:I really don't know GIMP basics, so could you let me know how to remove the words ("MX17" and "linux") and shadows? I gather that one can somehow disable or remove certain layers from the xcf file? How?
Let's open Gimp (mine is translated in french, i'm not sure the following are the exact terms used in the english version, but the shortcuts between brackets are the same ) !

First step, let's hide layers :
  1. Open the Toolbox (Ctrl +B) and the "Layers" window (Ctrl + L)
  2. In the "Layers" window, beside each layer and each group of layers, there is an eye icon. Click on the ones corresponding to the layers you want to hide (it's faster when clicking the group ones, as you can guess). When hiding the groups of layers, each hided layer's "eye" icon will become slashed so you'll know which layer has been hided. Click again on the "eye" icon to unhide if needed.
    Image
  3. When you're done, select the layer with the flat logo and from the Toolbox use the "Magic wand" (U) to select the colored part of the layer.
First, i give you the simplest and fastest method to colorize a selected area (as far as i know). There are other ways, both more precise and more flexible, to do this - for one of them, see section B.
    1. Select "Colors" in the toolbar and open the "Colorize" tool
      Image
    2. Play with the cursors (especially the "Hue" one) until you find the color you want. It isn't the current case but fyi if the area is white, darken it by changing its brightness (similar method for a black area) otherwize the color won't be applied.
      Image
    3. Enjoy !
    1. Select the color White and use the "Fill" tool (Shift+B) to fill the selected area with White (this way, you'll have a clean base to fill the logo with whatever you want, from patterns to gradients or precise colors). Or (my most prefered method since it preserves the semi-transparent pixels) use "Colors" > "Brightness/Contrast" to lighten the selected area until it becomes White.
    2. If you need a specific color (let's say Spring green ██ - hexa code #00ff7f - since people seem to enjoy this kind of color here ;) and, well, only 2 more weeks before Springtime ) :
      1. select "Colors" in the taskbar, then, near the bottom of the list, choose (i don't know the english term used here, sorry) the other "Colorize" tool
        Image
      2. on the bottom right of this newly opened window, click on "Custom color"
        Image
      3. in the little "HTML" field, replace the current color code with "00ff7f" (hexa code, but without the hashtag) then click on your keyboard's Tab key to apply your input. Here could you also use the several cursors to play with Hue, Saturation, Value or/and Red, Green and Blue - that's the way i build colour charts, eg. my Cobalt Beetle theme is all build around Hue @ 197.
        Image
      4. Finally, validate to apply the color to the area you've selected (here, the colorized part of the neutral logo) and enjoy your brand new logo \o/
      5. NB : If you change your mind and decide to modify the applied color using this second method, before anything, go back in history (CTRL+Z) to restore the "White" state, as this Colorize tool uses an addition mask to apply a color and, in short terms, white is its neutral base.
    3. Both of the methods above will also work on decorated areas (like the embossed logo joined in the xcf). The brightness and saturation of the textures/reflections/patterns will be kept while being uniformly tinted.
  1. If you want to apply a gradient, it's a similar method. Start from B/ 1/ to use a white area (it's not always necessary but i like to start from a clean base) and apply the gradient of your choice to the selected area (CTRL+Shift+A to unselect ;) )
I hope that the above is easily understandable and that i didn't miss anything.
cyrilus31 wrote:Bon tuto. Merci!
Avec plaisir o/
Last edited by k_sz on Tue Mar 13, 2018 2:59 pm, edited 2 times in total.
MX17.1 (sailing on the flow of ~daily updates)@modified_Futjitsu_s7220
> Intel Core2 Duo CPU P8700, 4 Go DDR3 SDRAM, SSD Samsung EVO 850 256Go + Hitachi Travelstar 7K320 160Go (7,2 krpm)

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asqwerth
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#4 Post by asqwerth » Tue Mar 13, 2018 1:32 pm

After following your tutorial, I was able to easily hide unwanted layers and change to different solid colours. What I couldn't figure out how to do was manually choose and blend different colours for a gradient, similar to how the ACYLS colour tool worked.

After a Google search for "GIMP" and "gradient", I was able to apply colour gradients to the logo by choosing one of the gradient presets (Abstract), editing it so the different colour bands were more similar in width (didn't try changing/removing colours), and then experimenting with the blend tool, cursor movement and different gradient effects.

After about 15 tries (!), this was I think the best:-
ksz-start_logo-MX-320gradient2aa-shad-ccw.png
Thanks for your help, k_sz.
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k_sz
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#5 Post by k_sz » Tue Mar 13, 2018 2:21 pm

You're welcome, asqwerth, glad i could help. And yes, Gimp gradients can be a headache especially if more than 3 colors are involved (and i don't even talk about involving transparency) and if I lose my patience...

This is so 1969 - MX Woodstock version ! Good job, i like the contrast between the logo's hard angles and the dynamic softness of the inner spirale - i also like the fact that the latter isn't centered.
MX17.1 (sailing on the flow of ~daily updates)@modified_Futjitsu_s7220
> Intel Core2 Duo CPU P8700, 4 Go DDR3 SDRAM, SSD Samsung EVO 850 256Go + Hitachi Travelstar 7K320 160Go (7,2 krpm)

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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#6 Post by richb » Tue Mar 13, 2018 2:30 pm

May I suggest that any more Gimp tips be put in the Tips and Tricks sub-forum under a thread header "Gimp tricks and tips"?
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#7 Post by k_sz » Tue Mar 13, 2018 2:38 pm

richb wrote:May I suggest that any more Gimp tips be put in the Tips and Tricks sub-forum under a thread header "Gimp tricks and tips"?
Hi richb, yes for sure. Furthermore, if moving this thread is possible, may i ask that someone move it to the said sub-forum ? I'll change its title as soon as it has been moved.
MX17.1 (sailing on the flow of ~daily updates)@modified_Futjitsu_s7220
> Intel Core2 Duo CPU P8700, 4 Go DDR3 SDRAM, SSD Samsung EVO 850 256Go + Hitachi Travelstar 7K320 160Go (7,2 krpm)

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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#8 Post by richb » Tue Mar 13, 2018 2:40 pm

I can move it.
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Re: [GIMP] About hiding layers and colorizing areas (precisely)

#9 Post by k_sz » Tue Mar 13, 2018 2:44 pm

richb wrote:I can move it.
Yes, please. Thank you !
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> Intel Core2 Duo CPU P8700, 4 Go DDR3 SDRAM, SSD Samsung EVO 850 256Go + Hitachi Travelstar 7K320 160Go (7,2 krpm)

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Re: [GIMP] Tips & Tricks

#10 Post by m_pav » Wed Mar 14, 2018 4:31 am

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