How to rescale a part of a 2D Matrix?

Hello,

I have read an image using imread() and it returns a 2D Matrix of uint8.

I proceed to get the indeces of parts of the image which meet some conditions. For example, I store make_zero = image < 100 as I want to make these values zero. And I do, scale_above = image >= 100 which I want to rescale from x to y. I was hoping to use the rescale function.

However, after I get this 2D Matrix logical where the conditions meet, I am unsure how to proceed on how to use these indeces.

Thank you for your help!

Answer 1

[Matt J]

Why not as follows?

image(scale_above) = rescale(image(scale_above),____)

[Kevin San Diego]

Thank you so much! I have been way to concerned with vectorisation and I feel as though it's changing the way I think about simple conditional statements.