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La Grange Camera

104 W. Burlington
La Grange, IL
708-352-0070

 

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Histogram Basics

This is a PowerPoint presentation on histograms...if enough persons are interested, I will make a presentation at one of our meetings.  Please let me know if you are interested email bill(at)ruting.us

Some notes about what you will see:

  1. I suggest using Internet Explorer, if possible, as it allows you to see my notes at the bottom of the screen.  You can resize the notes area to make it easier to read.
  2. If you use Internet Explorer it may take a bit to download images - be patient. 
  3. You may have to resize you window - find the gray horizontal bar above the notes at the bottom.  Put you cusros on it until you see a double headed arrow, then move the bar up.

For non IE users:

    The presentation is not fully compatible with FireFox so you won't be able to see the notes at the bottom.  For this reason I have included some notes here.

  1. If you are using FireFox you may see a page asking if it OK to proceed; click to "proceed anyway."
  2. On the slide "Two Types of Histograms" only one is shown, you will see the other in a later slide.
  3. On the slides with the different images, look closely at the histogram on the right; note how the curve is positioned.
  4. "Basically B&W" - histogram has large peaks on both edges relating to the large black and white regions.
  5. "Mostly Black" has a large peak on the left corresponding to the large black area.
  6. "Distinct Colors" shows clearly the peaks related to the strong blue and red areas, along with green which is the third color in the white area.
  7. The "Good Exposure" has the histogram centered with little at each edge.
  8. The "Over Exposed" shows how a large number of pixels (buckets) are filled - the histogram is piled up on the right.
  9. The "Under Exposed" shows a large number of pixels (buckets) have no or only a small amount - piled up on the left.

Bill Ruting

 

Click here to view presentation

 

This site is supported by the generosity of our sponsor La Grange Camera. 

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Last modified: 06/03/11