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Make transparent color of an image


I tried the following and I found it very good, therefore not covered: instructions from the blog Moosesoom . Thanks to the author for having reported the procedure that I am experienced and fully functional. I integrated what he wrote with other text.

You can find original page here: http://aplawrence.com/Linux/crousegif.html
1. Open the image using GIMP
2. Right click image and select:

-LAYERS> ADD ALPHA CHANNEL ( Layer / Transparency / Add Alpha Channel ). If it is already present an Alpha Channel, then it would be appropriate to remove the channel, or using The Gimp in Italian Layer / Transparency / Alpha Channel Remove.

3. Right click image and select:

SELECT-> BY COLOR (in Italian Select / By Color ).

4. Click on a color that you want to make this color will appear transparent 'surrounded by a dotted line at all points where you get the picture.

5. Then go to another menu, right click image and select:

EDIT-> CLEAR (in Italian Edit / Delete ).

The selected color should disappear from the image above and reveal the background of chess with GIMP which shows the transparent sections of an image.
6. Right click image and select:

SAVE AS (in Italian Save as )

If you want the newly created functions transparency on the web, you must make sure to save the image in GIF format .

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The Gimp and grayscale


To transform the free graphics program Gimp , picture, or part of it, grayscale, I suggest you read the following article .

1 - Conversion via "Grayscale" In summary, the first technique is automatic, let's do everything by the Gimp; menu: Image / Mode / Grayscale

2 - Conversion via "Desaturation" : command Desaturation be activated from the menu Colors> Desaturation ... is profoundly different from the command "Grayscale"

• command grayscale transforms any image on which you are currently working in Gimp , including at all levels, the command Desaturation only the active layer.
• command grayscale change the channels Red, Green and Blue destroying them and creating a new gray, from now on any drawing operation on the image will be grayscale, the command keeps desaturation three separate channels, so you can always paint operations of color or recolor it.

Warning: for this method functions, it is selected from the menu Image the RGB mode .