Filename: test-figures-find_objects.imb
2.52 Kb

Testing tools: , , , Elliptical, Rectangular and .

Use to select the background color, select Invert in the Selection Settings palette, this will select all objects in the image. Then you can test how Find Objects works.

Filename: test_detection_pixel.imb
7.35 Kb

Use to detect different groups of pixels with subtle color variations..

By setting the RGB channels tolerance to 0 in the Selection Settings palette you can select only exactly equal pixels.

You can also use Find Objects to get the area of all different groups of pixels.

Example 1.

Using a pixel with value R=181, G=181, B=181 was selected, with 0 of tolerance in each channel.

Example 2

This image shows several different area selections in different colors.

Filename: test_circle-area.imb
1 Kb

Testing tools: and .

This image allows comparing measurings done with different tools.

If you measure the circle with , it will count how many pixel are in the circle.
But if you measure the circle with , it will calculate the number of pixels using the following mathematical formulas:

Circumference Area = Pi * (diameter/2)^2
Elliptical Area= Pi * (diameter a/2) * (diameter b/2)

Although both tools will do the measurement correctly, they will give slightly different areas because one of them is using a mathematical formula, but other one is counting real pixels.

Both measurements will be valid, but they cannot be compared between them nor mixed when evaluating series.