In the first animation box, you can control the brightness area by dragging the corners of the brightness rectangle and in the second animation box, you can see and download the final GIF with the changed brightness. So, maybe its darker because you have chosen 'scene-referred' (which authors of the DT recommends). You can observe the brightness changes in multi-frame animations frame by frame or you can stop at the first frame to see how the brightness change affects one static frame. If you chose 'none' you get as raw as it can be (with minimal alteration from DT), in 'display-referred' you have base curve enabled and in 'scene-referred' you have filmic rgb and -0.50 exposure enabled. The two live animation boxes show GIFs before and after the brightness change. Similarly, if you set the brightness to 90%, then each RGB color channel is multiplied by 0.90 and the GIF becomes 10% darker. This effectively makes a GIF 10% lighter. For example, if you change the brightness to 110%, then the value of each color channel (RGB – red, green, blue) is multiplied by 1.10. If you leave the brightness value at 100%, then the GIF won't change. To darken the animation, enter a percentage value less than 100%. To lighten an animation, enter a brightness value greater than 100%.
The brightness area can be either the entire GIF or a user-selected region on a frame. It increases or decreases the amount of white light present in the pixels. By selecting your text layer and then opening the Character Panel, you can darken the text in Photoshop. This browser-based program makes an animated (or static) GIF file lighter or darker.
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