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Indexed layers

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Indexed layers Pedro Albuquerque 23 Jul 18:42
  Indexed layers Joao S. O. Bueno 23 Jul 19:03
  Indexed layers Liam R E Quin 23 Jul 19:06
   Indexed layers Pedro Albuquerque 23 Jul 19:30
Pedro Albuquerque
2015-07-23 18:42:11 UTC (over 9 years ago)

Indexed layers

Hi,

First of all let me say that I'm an almost complete ignorant about image manipulating. And also a very recent GIMP user.

That said, I'm trying to create a specific GNOME theme.

When I try to change colours (menu Colours->Colorize(?) or Colour curves) for png's in gtk3/assets, I get a message about not working with indexed layers.
GIMP has a very complete and vast help system. Could someone point me to where I should look for info about editing these files?

Another matter, I also tried a plugin for exporting to svg but I couldn't get it to work! :-(

Regards, Pedro.

Joao S. O. Bueno
2015-07-23 19:03:57 UTC (over 9 years ago)

Indexed layers

Just do "image->mode->rgb" before starting your work

On 23 July 2015 at 15:42, Pedro Albuquerque wrote:

Hi,

First of all let me say that I'm an almost complete ignorant about image manipulating. And also a very recent GIMP user.

That said, I'm trying to create a specific GNOME theme.

When I try to change colours (menu Colours->Colorize(?) or Colour curves) for png's in gtk3/assets, I get a message about not working with indexed layers.
GIMP has a very complete and vast help system. Could someone point me to where I should look for info about editing these files?

Another matter, I also tried a plugin for exporting to svg but I couldn't get it to work! :-(

Regards, Pedro.

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Liam R E Quin
2015-07-23 19:06:24 UTC (over 9 years ago)

Indexed layers

On Thu, 23 Jul 2015 19:42:11 +0100 Pedro Albuquerque wrote:

I'm trying to create a specific GNOME theme.

When I try to change colours (menu Colours->Colorize(?) or Colour curves) for png's in gtk3/assets, I get a message about not working with indexed layers.

At the top of the window, in the window manager title bar, you'll see, e.g. (clean socks.png (8bit indexed)
meaning the image uses a fixed "palette" of colours. You can edit the palette directly, or for more creative changes, convert the image to RGB with image/mode/RGB and then you can use as many colours as you like - but some video cards, especially ones more than 20 years old, may have problems. Those systems can't display most Web pages either.

Another matter, I also tried a plugin for exporting to svg but I couldn't get it to work! :-(

My telepathy skills are on the blink today so I'm not certain which exact plugin it was or what exactly went wrong. However, GIMP is a pixel-based image editor, and SVG is a vector format. Use Inkscape to edit or create SVG.

Liam

Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/
Pedro Albuquerque
2015-07-23 19:30:05 UTC (over 9 years ago)

Indexed layers

Thank you both. I thought it would be more complicated.

Regards, Pedro.

Qui, 2015-07-23 às 15:06 -0400, Liam R E Quin escreveu:

On Thu, 23 Jul 2015 19:42:11 +0100 Pedro Albuquerque wrote:

I'm trying to create a specific GNOME theme.

When I try to change colours (menu Colours->Colorize(?) or Colour curves) for png's in gtk3/assets, I get a message about not working with indexed layers.

At the top of the window, in the window manager title bar, you'll see, e.g. (clean socks.png (8bit indexed)
meaning the image uses a fixed "palette" of colours. You can edit the palette directly, or for more creative changes, convert the image to RGB with image/mode/RGB and then you can use as many colours as you like - but some video cards, especially ones more than 20 years old, may have problems. Those systems can't display most Web pages either.

Another matter, I also tried a plugin for exporting to svg but I couldn't get it to work! :-(

My telepathy skills are on the blink today so I'm not certain which exact plugin it was or what exactly went wrong. However, GIMP is a pixel-based image editor, and SVG is a vector format. Use Inkscape to edit or create SVG.

Liam