Beginner combining masks problem

[pselaphid]

I am in the early stages of learning to use Pix, mainly following the tutorials and workflow examples, and I have encountered a problem I can't seem to get past.

In preparation for HDRWAV I am trying to create a combined mask using the "luminance clone+~star mask" to generate a combined mask in pixel math. The new image generated shows only the star mask, none of the lum data. I have run this numerous times based on the "finlrgb" workflow tutorial on the same M106 target. This is standing in the way of progressing up the learning curve. If someone could guide me past this little obstacle or direct me to a thread dealing with similar issue I'd appreciate it. My searches have not landed on anything that explains this beginner's problem.

[RickS]

Is the lum data linear? (unstretched)  For a mask you'll want a stretched copy of the lum.

[pselaphid]

I am attempting it after the permanent stretch of the Luminance image.

[pfile]

you might try clicking Rescale in PM... otherwise not sure why this is not working for you without seeing the input images. but if you invert the starmask you are probably ending up with an all-white image? are you trying to remove the stars from the Lum mask? in that case you probably want to be multiplying the Lum by the ~star_mask.

rob

[pselaphid]

Thanks, I'll try rescaling and will generate some screen shots later if that does not work. I note that the rescale is unchecked by default in the later versions and it didn't occur to check it. I think when the tutorial I was following was made it was checked by default.

[pselaphid]

Checking the rescale box fixed the problem! Thanks.