Concept
Using Lightness channel in the Lab color mode create
amazing grayscale output.
1. Open an image to apply photoshop Lab Color mode.

2. Image> Mode > Lab
Color
3. Switch to Channels Palette or
Windows > Channels
4. Select Lightness

5. Delete a or b Channels by dragging it to the "Delete
current channel" Button shown in red mark.
6. Image > Mode
Switch to Grayscale from Multichannel

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