changing the pixel color in an image

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Busy Bee
Busy Bee 2018-1-17
回答： Image Analyst 2018-1-18
I have a raster image and I have the coordinates of the shown point. I need to change the colour of the area occupied by the image(i.e. the black pixels) in the two perpendiculars drawn from the same point(along x and y-axis). Is there any function that I can use?
  2 个评论
Jan
Jan 2018-1-17
I do not understand the question. What is "the coloured area"? Do you mean the black pixels which are under the green bars? Or inside the rectangle built by the green bars?
Busy Bee
Busy Bee 2018-1-17
编辑：Busy Bee 2018-1-17
after changing the colour of the black pixels inside the rectangle to yellow, i needed to know the total number of yellow pixels. But now i get that I can do it directly using the find command.

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采纳的回答

Image Analyst
Image Analyst 2018-1-18
Convert your calibrated x,y into rows and columns, then make two masks and AND them together and use sum() to count pixels
yellowMask = rectangleMask & ~blackPolygonMask;
numYellowPixels = sum(yellowMask(:))

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