Great Photo Resource and More about Pixels

Last week I blogged about understanding pixels and their relationship to photo usage.  I’m continuing that today but first I want to call your attention to a great local photo store right here in the Philadelphia area.

 Allen’s Camera has been a family owned business since 1977. They cater to pros and amatures alike and have as complete a stock of cameras, lenses and accessories as anyone could hope for.  Prices are usually as good or better than the big New York stores like  B&H and Adaroma and their personal service and knowledge is outstanding. I can’t tell you how many times they have gotten me out of jams when I needed some obscure piece of equipment or supply at the last minute.  Allen, Brandon, Rob and Marlena are always ready to explain and show the latest equipment and techniques.  If you are an amateur you will love their personal service and photo knowledge. If you are a pro you will be amazed at how much high end equipment is in stock ready to go.  It is really just a treat to visit the store and I highly recommend that you do.  

Their address:  Allen’s Camera and Video, 4401 New Falls Road, Levittown PA 19056 / Telephone them at 215-547-2841 / Visit their web page at http://www.allenscamera.net

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More about pixels.

Last week I wrote about the proper way to size photos using pixel dimensions.  For Newspaper printing – 200 pixels per inch at 10 inches, Magazines – 300 pixels per inch at 10 inches and for viewing on a computer screen – 72 pixels per inch by 7 inches or less.  These were guide lines only but are good starting places.  The big lesson here is that you need to know the finished printed size as well as the number of pixels per inch to determine the proper file size to deliver.

Digital Photos are Pixel Based.  I often here people referring to the size of a digital file using the term dots per inch or lines per inch.  Dots and LInes are printing terms and have no relevance to digital photos except that when printed they must be the correct size to satisfy the needs of the press.  Let me explain. A black and white photo in a newspaper is usually printed using a 65-line screen when making the halftone.  The halftone is what actually places the ink on the paper using a series of dots.  Examine a newspaper photo with a loop and you will see black dots and white dots.  The closer the black dots are the darker the photo.  The more white space between the black dots the lighter the photo.  In color printing the screen used is usually up around 150 lines per inch and the halftone is made up of cyan, magenta, yellow and black dots.  Complicated, yes but all you have to remember is to refer to digital files as being made up of pixels.

Enough Said.  Next blog deals with light modifiers for speed lights.

 

 

 

 

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