Bold pencil used very lightly along with a rubber.
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The best tool to use to measure distance underwater is
The paint bucket tool generally comes along with image editing software. What it does is fill an area on the image with a selected color. The tool usually fills to the boundaries of a solid color. As an example if you have a black box and apply red with the paint bucket tool it will convert the entire box to red. More powerful imaging software will allow for thresholds to fill shade ranges of colors with the selected color.
By drawing a line of 'best fit'
a tape measure