Masking out pixels one by one is tedious, how do I mask out a region more easily?

Download ds9poly. C: First, download my ds9poly. C program.

I will explain how to use this below. But, first compile it by doing: cc -o ds9poly ds9poly. C Download fillpoly.

F: Next, download my fillpoly. F program. I will explain how to use this below.

But, first compile it by doing: f77 -o fillpoly fillpoly. F Download SAOimage DS9: Now download SAOimage DS9. This will let you draw polygons over the region you want to mask out without having to guess.

Drawing a polygon into DS9: Click on the "Region" button, then the "Poly" button. Create a polygon by click-dragging (don't just click -- you'll have to drag too) a square box in the image. You start out with a square, but you can add vertices by clicking and dragging on the green border.

You can also delete vertices by putting your cursor carefully on a vertex and hitting the ``Backspace''key (if you delete the polygon by accident, go to the ``Edit'' menu and hit ``undo''). Saving the polygon: Once you have a polygon to your liking, ... more.

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