open-discussion
open-discussion > How to Change the Direction of Overlay's Color?
Aug 2, 2020 05:08 AM | Momo Li
How to Change the Direction of Overlay's Color?
Hi all!
We have a CBF change map where 1) positive values indicate an increase in CBF, 2) 0 indicates no change, and 3) negative values indicate a decrease in CBF. To overlay this CBF change map to MRIcroGL, we split the map into two: the negative and the positive overlays, hoping to use two different colors for the two maps to visually illustrate areas with more increase or decrease in CBF.
We tried a few different colors; it seems like that the colors always go brighter for the more positive values and darker for the more negative values. This scheme works for the positive overlay (the lighter the color, the more increase in CBF, with 0 being the darkest). But when it comes to the negative overlay, it makes the more negative values (which represent more decrease in CBF) darker and 0 the lightest.
I hope to make zero the darkest for both maps, and the greater the change in value (regardless if it's positive or negative), the brighter the color. So my goal is to change the direction of color for the negative overlay. Does anyone know how I can achieve this? Thank you so much!
Best,
Momo
We have a CBF change map where 1) positive values indicate an increase in CBF, 2) 0 indicates no change, and 3) negative values indicate a decrease in CBF. To overlay this CBF change map to MRIcroGL, we split the map into two: the negative and the positive overlays, hoping to use two different colors for the two maps to visually illustrate areas with more increase or decrease in CBF.
We tried a few different colors; it seems like that the colors always go brighter for the more positive values and darker for the more negative values. This scheme works for the positive overlay (the lighter the color, the more increase in CBF, with 0 being the darkest). But when it comes to the negative overlay, it makes the more negative values (which represent more decrease in CBF) darker and 0 the lightest.
I hope to make zero the darkest for both maps, and the greater the change in value (regardless if it's positive or negative), the brighter the color. So my goal is to change the direction of color for the negative overlay. Does anyone know how I can achieve this? Thank you so much!
Best,
Momo
Threaded View
Title | Author | Date |
---|---|---|
Momo Li | Aug 2, 2020 | |
Momo Li | Aug 2, 2020 | |
Momo Li | Aug 2, 2020 | |
Chris Rorden | Aug 2, 2020 | |
Chris Rorden | Aug 2, 2020 | |