Mask an image using channels - part 1

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Tutorial goal:
In this tutorial we learn to mask an image when the background is light and the main object dark. We do this using channels.

author:

Claudiolky

Credits earned for writing this tutorial:
500 ($5)

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step 1

The source

step 2

Before you start your work, it is better to increase your image:
CTRL + zero or CTRL + Alt + zero (get 100%)

step 3

Go to the channel palette and inspect which one has the finest detail and best contrast. In this case the blue one is better. Than drag the blue channel at the icon(create a new channel) besides the trash icon.

step 4

The goal is to make the light areas white and the darker areas black. Select Image>Adjustment>Levels:

step 5

Use the lasso tool(or other tool) to select the inside of the image and fill the selection with black:

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