"False color" is the appropriate term for assigning different colors to different channels in multichannel images (as opposed to "pseudocolor", which is mapping intensities to colors with single channel images).The second image Chris posted is "true color", or RGB. In RGB images, hydrogen alpha looks red because it really is red.Thanks. Why does your overlaid image look much redder here? Different one than the one you posted earlier I guess?
Here is mine with broadband, so "true" color. Only a small section with my smaller FOV.
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The first image Chris posted is a narrowband image. In narrowband images, hydrogen alpha is often mapped as another color than red, often as green. We may call it a false color image, although Chris, I'm pretty sure, prefers the term "mapped color images".
I imaged this object a while back in six channels, red, green, blue, H-alpha, [ S II], and [O III]. And then I played around with different ways of presenting that data. Interesting variations, each of which brings out different features.
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Statistics: Posted by Chris Peterson — Thu Mar 27, 2025 4:20 pm — Replies 15 — Views 710