Episode 055: hic sunt dracones – Adventures in LABland

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This week I take a trip into the future of GiMP – by visiting Cinepaint. I read in the book “Welcome to Oz” from Vincent Versace (Tip for the German audience: Wenn ihr das Buch bei einem an den Großhandel LIBRI angeschlossenen Buchhändler bestellt, ist es billiger als bei Amazon!) how to adjust colours in LAB mode. He claims that it is much more intuitive than in RGB – and he is right.
I was so fascinated by playing with these colours that I spent a long time with that. If you get bored – just switch off. The only information after the start of John Pazdan’s “Lazy Ass” music is, that I save the curve for later use with the big image.
Result of this expedition into color space: There are no dragons out there, but now I want 16 bit and I want LAB! Now! ;-)
For converting an image to LAB you need a colour profile. I got mine from here, but the whole site is worth a visit.

Some more links: Wikipedia has a lot about Colour, Colour Spaces, RGB, LAB and HP has a Colour Distance Calculator.

At the very start of the video I take up the “opacity painting” and forward you a tip from Daniel, how to select an area of uniform opacity.

I said once: “No ads here!”, but here is one:

The TOC of this Episode

Selecting areas of same opacity (update for #54) 1:30
Colour spaces 4:00
LAB colour space 6:47
LAB degrades images in 8 bit 14:22
Cinepaint 18:37
Visualisation of the colourspace by Cinepaint 21:36
Converting to LAB 22:36
Correting colours with the curves tool in LAB 24:00
Playing with the colours 27:10 (No real information after this point)
Music “Lazy Ass” by John Pazdan
Saving the curve for the large image 33:00

BTW, “hic sunt dracones” means “Here are dragons” and was used by a map maker in medieval times to mark unknown territory.

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11 thoughts on “Episode 055: hic sunt dracones – Adventures in LABland

  1. There certainly seems to be a lot of opportunity available for modifying the colour with respect to hue, brightness and saturation. Is it possible to select portions of the image and make selective alterations?

  2. @Tengu: For us it’s nearly no difference, the mtg server gives normally most of the bandwidth. :-)

    @Norman: Of course. Use a layer mask and work in several layers. One for the clouds, one for the sky in my example.

  3. That was an interesting show. I have never used LAB but it appears to have potential as you showed in this episode.

    Nice detail about “Hic sunt dracones”. I must remember this expression.

  4. I’m just in the middle of catching up the older shows. In #29 you mentioned that you were planning a show about graphic tablets. I’m about to buy one and I am eager to hear your opinion. Any idea when the show will be broadcast?
    Btw: thanks a lot for your work. Your podcast kept me to stick with GIMP and through it I learned how to process my pictures! Great work!

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