Microsoft Paint not filling in every pixel
Suppose I have an image, and this image is a blue ball on a yellow background. Thus, the image consists of two colors to the human eye: Blue and Yellow.
However, near the borders of the ball are varying shades of blue inside the ball, and varying shades of yellow outside of the ball.
I would like to make these pixels the same color "Red". They are almost the same yellow, but the fill function can't tell the difference.
How do I make these pixels the same color without having to fill them in, one by one?
This isn't possible in Microsoft Paint.
The paint bucket tool in Paint is unsophisticated and only pours colour into contiguous pixels that are absolutely identical in colour to the pixel where the tool is clicked.
What you're attempting to do requires a more advanced image-editing program, such as Photoshop. Photoshop allows you to adjust the tolerance of its fill tool with values ranging from 0 to 255.
- Tolerance = 0 makes the tool highly specific, so the tool only affects pixels which are absolutely identical in colour.
- Tolerance = 255 selects pixels of all colours (i.e. the entire image).
The behaviour of the paint bucket tool in Microsoft Paint is the equivalent of Photoshop's paint bucket tool when set to 0.
Unfortunately, as Paint does not allow you to increase its tolerance from 0, you are stuck with it in a highly specific mode which struggles with images that contain even extremely subtle colour gradients.