Tommy Mastro:
I primarily use Pixinsight, but I also have Affinity Photo (a PS rip off).
Until just now, I’ve never heard of sampling brightness or color. Other than looking at a Histogram and making sure my data is not clipped.
I’ll need to look into this, thanks.
Tommy
Tommy’s suggesting is great. You can also sample pixels in PI but the values are displayed as normalized 0 - 1.0. On that scale, a background level of 16 in an 8 bit channel is displayed as 0.062. The measurement is more accurate if you sample more than single pixels. In PhotoShop, you can set the size of an averaging window. I normally use an 11x11 “eye dropper” to sample the back ground levels.
You can also use a histogram display to look at the background values but that’s going to be nearly impossible with your image simply because the background is not well defined.
- John
