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More help! Oh my.

May 29, 2011, 18:27
Post: #1
More help! Oh my.
Okay..

http://imageshack.us/f/807/razorr.jpg/

In that image is another car. I want the whole car to be black and yellow with that design. HOWEVER! There are small green and red lines that I can't seem to get rid of.. Any methods that are quick and easy to get rid of those lines? I'd hate to have to zoom in to like 200 and do it manually..
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May 29, 2011, 18:52
Post: #2
RE: More help! Oh my.
From what I understand, you want to remove the thin lines that run in the black along the yellow (trunk and sides). The idea is to use a selection to restrict the effects of the brush strokes so:

- start "Select by color" tool
- set a rather high threshold (50 or so)
- click in the yellow near the border, this should select most of the yellow. If you find you select some of the line you want to remove, reduce the threshold and start over
- Use Select/Grow to grow the selection by 3 to 4 pixels so that it bleeds a bit in the black but doesn't include you line
- Invert the selection
- paint over the lines with a black brush. No need to be too accurate, the brush won't have any effect outside the selection.

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May 30, 2011, 17:25
Post: #3
RE: More help! Oh my.
I figured it out.. But I am now having a hard time making the background on this logo from white to black

[Image: unledfrs.jpg]

Uploaded with ImageShack.us

When I use the select by color, I will color it black and the little lizard will get painted over.. Or the GEICO blue color will get darker.. Any tips?
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May 30, 2011, 19:36
Post: #4
RE: More help! Oh my.
This is done by making the current background transparent, and adding a layer of the required color below. Typically:

- select by color to select the background
- save to channel
- shrink the selection by 2-3 pixels
- erase. This will erase everything, except the non-white stuff and a 3px border around it
- in the channels dialog, right click on saved channel, and "Channel to selection" (ie, restore the original selection)
- grow the selection by one pixel (to that it bleeds a bit inside the logo)
- Colors/Color to alpha (and use white, which is the default)

However:

1) The pertinent part of your image is very small, it would be better to start from a bigger logo and scale it down
2) since you are using low quality JPEG all your image have very visible JPEG artifacts. For this kind of work, you should be using PNG (i.e., strive to import PNG images, and show PNG results, while keeping your project in an XCF file). n this image you can get rid of most of them before applying the procedure above by using the curves tool to make all light grey totally white (without whitening the lizard...)
3) Dark blue on black won't make a very visible logo. On your current car, all the dark colored letters (and this includes plain red) are on white background.

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