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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

4) Because of this parameter’s maximum value is 255 and we want APL in percent, you can use this simple equation to convert it to percent:

APL (%) = (Mean value × 100) / 255

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