Use an image editor. You can try inverting the image (negative colors) or use an Replace Color tool like what is found in Irfanview to replace the black with any color of your choice.
On Tue, 11 Mar 2025 16:45:34 -0700
"Fred, W9KEY via groups.io" <fred.schwierske@...> wrote:
the QSO Rate line graph can not be changed from its black background (at least not that I can find).
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73
-Jim
NU0C
Jim Shorney