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How to Calculate APL (Average Picture Level) of a Picture Using Photoshop?

1) Open your desired picture in Photoshop

2) If you don’t have histogram tool, enable it from Window menu and select histogram

Calculate APL (Average Picture Level) Picture Photoshop

Calculate APL (Average Picture Level) Picture Photoshop

3) Now after opened histogram tool, note value of Mean

Calculate APL (Average Picture Level) Picture Photoshop