Photo Extension Histogram provides Tonality, RGB Channels, and Luminosity histograms for photos stored in the Apple Photos app for iPhone and iPad. This extension is great for photographers who need to analyze the tonal and color distribution of photos to identify underexposure, overexposure, and appropriate levels of contrast. The extension also explains, advises, and guides you on how to understand each histogram to be a great photographer!

To use this extension, open the Apple Photos app, select any photo, and then enable the extension through the Action button. You may also enable the extension when editing a photo. The enabling process needs to be done only once, and the extension will be available for all photos.

Photo Extension Histogram:
+ Supports most photo apps Action button.
+ Works on the iPhone and iPad.
+ Available from Action Extension or Edit Extension.
+ Shows Tonality Histogram.
+ Shows RGB Channel Histogram.
+ Shows Luminosity Histogram.
+ Provides advice about dark, light, and mid-tones.
+ Provides advice about high and low contrast.
+ Explains each histogram in plain English for everyone to understand.
+ Save photo with histogram in the camera roll.

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What’s New

Version 2.2

We're making Photo Extensions the best extensions for photographers using the Apple Photos app!

+ Improved the iPad user experience

Ratings and Reviews

3.8 out of 5
4 Ratings

4 Ratings

JohnBoy5562 ,

The only one in the bundle that I can actually use

This app has some good information and helps you understand the histogram of a photo. The only reason it’s 4 stars is because I bought it in a bundle and the rest of the app are ok but the watermark app will not batch watermark and the resize app will not batch resize, you have to do them one at a time.

Update 5-30-19

I’m not changing my rating from 4 stars. Because it is the best extension/app they have in my opinion. The reason I didn’t give them 5 stars on this extension is because the others in this bundle was a disappointment. But it was my fault for thinking they were app’s. They are not but extension.

Wanni ,

Simple, brilliant and to the point

Good and fast histogram tool. Can be called from share sheet and as extension in edit window.
Highlight clipping and shadow warning would be a nice-to-have feature. Not included yet, and not critical.

Perlgoon ,

It does what it says, but not without extra effort

Reading a histogram is essential to creating quality photographs. There are too many situations that will fool the camera and produce bad results. This program does what it says it does. However, you have to press the share button each time and there is no way for it to automatically come up as browse through images. Additionally, it does not interface with the Sony Play Memories app which I use to control the camera. So I have to go through three steps to see a histogram which should be automatic. Suggestion: add an eye dropper and flash highlight warnings (like the camera does).


Digiguys Inc.
125.2 MB
Photo & Video

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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