Pixel Maths

[Jules]

I am trying to merge two images into a new image. I am having problems with percentages i.e. 30% of an image + 70% of an image = new image. Applying this as a maths function has made some pretty weird results. I think it is just a matter of using the correct terminology in PM?

I have used:$T = ((0.7 * Ha image) + (0.3 * OII image))

Jules

[Carlos Milovic]

You don't need to use "$T ="... when you execute pixelmath, it replaces the target image, or makes a duplicate of it, and then replaces data (replace or new image modes).
Other than that, it is ok. Just remember to use the ID of the image for each filter. If it is not that simple, use the equation editor, and load the image names from the combobox of view listings

So, to sumarize, it should be:
0.7*ImageHa + 0.3*ImageOIII

(see that there are no spaces in valid IDs).

[Jules]

Crikey Carlos

That is embarrassingly easy, thank you for your time!

Julian