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Making Rainbows

Apr 29, 2012, 15:05
Post: #1
Making Rainbows
I had a go at making a fake rainbow to use in a design the other day. This-

[Image: nDHaY.jpg]

I did it by first creating a circle on a transparent layer and filling it red (diamater=4000px) . Then I copied and pasted it in as a new layer, bucket filled it to orange and reduced the size to 95%. I then repasted the red circle in and repeated the process a la ROYGBIV... Then I merged the layers down and hey presto- a rainbow.

Problem is that when you zoom in to it it doesn't appear to be a perfect transition between the layers. eg.

[Image: cT00e.jpg]

Also, It converts fine to jpeg on my computer but the site that I want to upload it to seems to make the edges of the rainbow a bit rough. Can't work out how to take a screenshot of that, it shows up when you look at it on full screen and I don't know how to use my snip tool without minimising it.

Anyway, I just wondered if anyone knows what I did wrong and if there is a better way to do this?
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Apr 29, 2012, 15:38
Post: #2
RE: Making Rainbows
Basically you resized the anti-aliasing pixels. You should have recreated a proper selection each time to get proper anti-aliasing pixels for each circle.

There are plenty of sites that do untoward things with the images uploaded to them. Download the image from the site and compare it to your original. Is it the same file format and size? Or is the HTML of the site constraining the image to some size?

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Apr 29, 2012, 15:50
Post: #3
RE: Making Rainbows
Also have a look at RobA's script that fills in between 2 paths

http://registry.gimp.org/node/26195

probably have to make your own rainbow gradient but otherwise it works well.

[Image: 0cbcH.jpg]

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Apr 29, 2012, 17:58
Post: #4
RE: Making Rainbows
One can also make a radial blend, the trick being to have the rainbow colors only on part of the gradient, or use my Wrapmap script with a rainbow bitmap.

But all these methods give a very different rending from the stacked circles.

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Apr 29, 2012, 22:53
Post: #5
RE: Making Rainbows
Thanks guys. Yeah as you said ofnuts the effect i am looking for is stacked circles. I redid it anyway by creating decreasing concentric circular selections and filling them with the relevant colour. Problem solved and mistake learned from :-)

Still don't know why the site is screwing up the quality though, but I am emailed support anyway to ask them.

Just about finished two major designs that started off as simple ideas and ended up getting way too complicated. Looking forward to getting my life back soon!

[Image: gEQNG.jpg]

[Image: JsPhi.jpg]
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Apr 29, 2012, 23:14
Post: #6
RE: Making Rainbows
Cool.

Btw, there is a much simpler method to get a rainbow form a gradient, Just use the "offset" i in the gradient tool. If you set the offset to 75 (this is a percentage) and create the gradient by dragging from center to edge, the gradient really starts in the last 25%.

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