Camera Test: How Does the Pentax K-r DSLR Measure Up?

Camera Test: How Does the Pentax K-r DSLR Measure Up?	View this email online

	March 24, 2011 Breaking news from America's top photo magazines From the Forums: Upload and share your very best springtime flower picture for critique. Our readers share their thoughts. Join and Contribute!

	Test Report: Pentax K-r The latest starter DSLR from Pentax offers lots of photographic firepower. How To: Create a Faux Tilt-Shift Effect Creating a miniature effect in Photoshop is easier than you think. Gallery: NASA’s Guide to Photography with a Hasselblad Here is your chance to relive those childhood dreams of being an astronaut-photographer. How To: Plan the Perfect Subterranean Photo Adventure Thousands of caves across the US make for great photo-ops. Photo of the Day Think your photos have what it takes to be named Photo of the Day? Then upload your best shots to our Flickr page. See the whole gallery here TECH SUPPORT Pixel Protocols Q. What happens to all the other pixels when I shoot in medium JPEG or small JPEG? And what is the sensor doing differently between fine and normal quality? A. The camera uses information from all the pixels to generate JPEGs. In the case of the small and medium files, the processor sizes down the file in much the same way image editors downsize pictures, resulting in a lower pixel count than full resolution. JPEGs are also compressed files, and the quality settings indicate the amount of compression: a normal-quality JPEG is compressed more than a fine-quality JPEG, and thus gives you a somewhat smaller file size even if the two JPEGs have the same pixel resolution. In pictures without a lot of fine detail, you may not notice the difference, particularly at low print or screen magnifications, but in very intricate shots, and/or big blowups, the higher compression can show up in artifacts, notably jagged edges in details. For most applications, we recommend going with the highest pixel count and the best quality—you can always size the image down in any image editor later.

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