histograms explained
DESCRIPTION
A talk I gave at BarCamp Brighton 3 to explain what histograms are and how you can use them. Also introduces my little web service and bookmarklet for histogramming any photo across the web.TRANSCRIPT
Photo HistogramsAnd Cool Things You can do with them
Cristiano Betta - CristianoBetta.com
Photo Histograms
Histograms?
• Histograms?• How do they work?• How can I use them?• Cool Things!
Histograms?
In-camera Histogram
In-camera Histogram
Adobe Lightroom Histogram
What’s the difference between
This photo
.This photo.
..This photo..
...This photo...
.... and this photo?
Looking at the histograms...
How do they work?
Meet Lenna
Meet Lenna
Meet Lenna
Meet Lenna
Meet Lenna
Meet Lenna
Meet Lenna
Meet Lenna
Dark Pixels Light Pixels
no pixels
Many Pixels
Dark Pixels Light Pixels
no pixels
Many Pixels
Dark Pixels Light Pixels
no pixels
Many Pixels
How Can I use them?
Exposure
Highly Underxposed
Slightly Underxposed
Properly Exposed
Slightly Overexposed
Highly Overexposed
Dark Pixels Light Pixels
no pixels
Many Pixels
Dark Pixels Light Pixels
no pixels
Many Pixels
Contrast
Dark Pixels Light Pixels
no pixels
Many Pixels
Dark Pixels Light Pixels
no pixels
Many Pixels
editing
Cool Things!
Segmentation
Histograms as an Image
Histograms Anywhere
Bookmarklet + Webservice
http://histogram.cristianobetta.com
Last Notes
There is no perfect Histogram
Histograms Just “are”
• Ken Rockwell’s Guide to Histograms - http://www.kenrockwell.com/tech/histograms.htm
• Timothy Edberg on Histograms - http://www.edbergphoto.com/pages/Tip-DigitalHistograms.html
• Histograms as an Image - http://www.ironicsans.com/2007/09/
Sources