How to chose a line from a list

[magicmelody1007]

Hey guys,
I have a problem. I don't know how to chose a line from a list and I have to chose the red values ​​of the pixel of costume current block.
How do you do that?

Thanks for helping

[ego-lay_atman-bay]

Do you just want a list of all the red values? If so, here's how to do it

[helicoptur]

You can use [scratchblocks](item(1 v)of([columns v]of[]::list[/scratchblocks] to get the red values.