>>1560678Just use the colors that are used in the source. If there are about 3 or 4 colors you can see in a part that you can make into a gradient, then get each color and save it as a swatch. A good idea here is to use the "New Color Group" button on the swatches panel (it looks like a folder). This will create a separate folder where you can put your colors. So get all the colors required for a particular gradient and put them in that folder. Align them nicely in the direction the colors need to be for the gradient and just start adding the colors in (either by dragging and dropping the swatches in or by double clicking the stops that are already there). From there, just keep hiding and unhiding your gradient layer so you can see where you need to move the stops to match the original. Most will be linear gradients, but it's the same process for a radial gradient.
I'll post a picture that gives some reference...
