5 replies to this topic

[artcoder]

I have a logo in JPG flattened format on a white background. There is text and some anti-aliasing.

What is the best technique to extract that logo and place it on blue background for example? No, I don't have the layered source graphic file. The magic wand to does is not able to do a perfect job. There are halos of tiny pixel after the extraction and when placed on blue background.

[Dance]

There are so many different extraction techniques its hard to say without you posting the image for us. if there is no other white in the image then the background then you may be able to do it by the channels, or the extract filter. i would prob go with some kind of standardized method and then prefect the extraction manually via some mask. Possibly even use multiple techniques for different parts of the image. But i cant say how without seeing the image.

[Jacorre]

If you use the magic wand tool and delete the white background, you can then save the image as a gif and use the color of your background as the matte color. Don't think you'll get the halo effect if you use a matte color.

[Scythar]

Usually the following (or combined):
if sharp edges: pentool to draw around it very detailed and then turn path into selection.
if fussy edges use the brush tool in mask mode with 0% hardness, start with large brushes and go in gradually with each time smaller brushes, keep away from the edge with ca. 1/3 of brush size. painting white adds to the mask (erm... i think) and painting with black substracts from the mask (and thus the selection when you turn back in normal mode)

[artcoder]

Yeah, I have fuzzy edges. Shape edges are much easier to extract. Okay, I have to try this, "brush tool in mask mode with 0% hardness".

[Kilamike]

Pen tool is another way to extract your logo, but it'll take some time to do that, as most edges aren't really that consistent. Try to attached first the logo on your blue background, afterwards set the blending option to darken or multiply. Hope it works.