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Lens Tests: A Simple Method


Saved by uncleflo on January 6th, 2019.

This is a simplified subjective method of testing lenses optical sharpness. This should not be confused with tests for focus accuracy and discrimination in a 3D environment, that is a totally different issue although often confused by the inexperienced. A focus accuracy test is suggested here Focus Test. The advantage over this method, compared to just taking a shot of a garden etc, is elimination of variables such as subject and camera movement, insufficient depth of field, flatness of field and variations in focus location. It uses a nice consistent high contrast subject to make comparisons easy; checking sharpness on general photographic views is not very easy. As the method is subjective, it is worth testing against a known good lens for comparison.

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ISO 12233 Test Chart


Saved by uncleflo on January 6th, 2019.

In 2000, the International Standards Organization adopted ISO Standard 12233: Photography -- Electronic still-picture cameras - Resolution measurements for the measurement of camera resolution. This standard is protected by copyright, but the design of the associated test chart seems not to be protected; its description has been available on the Web in an Excel spreadsheet. I have semi-manually converted this to an Adobe Illustrator file which is displayed here. In 2014 and again in 2017, the ISO revised the standard and the chart below was replaced by several new ones. Those new charts are not available here. In principle, you should be able to print this chart and perform resolution tests on your camera. The reality isn't that simple; there are lots of subtleties having to do with focus distance, quality and contrast of your printer, evenness of illumination, surface reflections, etc.

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MAVO Cine Camera


Saved by uncleflo on November 28th, 2018.

MAVO and MAVO LF are based on the same image process platform, using advanced color processing architecture and whole new CMOS image sensors to achieve super low-noise, high dynamic range. Whether it is the S35 format version of MAVO or the large-format version of MAVO LF, the 6K cameras can bring stunning details and organic images. MAVO LF with large-format sensor provides cleaner images, wider viewing angles, shallower depth of field, and more immersive presence for cinematographers. Both MAVO and MAVO LF can shoot 6K wide 66fps, 4K wide 100fps slo-mo. Both slow-mo and normal frame rate can get the same superior images, more than 14 stops of latitude, pleasing skin tones and shadow details are reserved perfectly. With 6K 3:2 aspect ratio, in addition to the conventional 16:9 and 17:9 standard aspect ratio, the CMOS sensor can also provide a variety of image formats, such as 4:3, 6:5 S35 anamorphic shooting, even the open gate 6016×4016, up to 24 million pixels’ images!

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Stackoverflow - offsetTop vs. jQuery.offset().top


Saved by uncleflo on May 9th, 2018.

I have read that offsetLeft and offsetTop do not work properly in all browsers. jQuery.offset() is supposed to provide an abstraction for this to provide the correct value xbrowser. What I am trying to do is get the coordinates of where an element was clicked relative to the top-left of the element. Problem is that jQuery.offset().top is actually giving me a decimal value in FFX 3.6 (in IE and Chrome, the two values match). http://jsfiddle.net/htCPp/ exhibits the issue. If you click the bottom image, jQuery.offset().top returns 327.5, but offsetTop returns 328. I would like to think that offset() is returning the correct value and I should use it because it will work across browsers. However, people obviously cannot click decimals of pixels. Is the proper way to determine the true offset to Math.Round() the offset that jQuery is returning? Should I use offsetTop instead, or some other method entirely?

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Inventive play experiences for the whole brain


Saved by uncleflo on July 3rd, 2017.

Pixel Press is a technology company focused on building engaging gaming experiences for both sides of the brain: the analytical left side and the creative right side. Our products are fun for all ages, and flexible enough for many applications. Our “build your own video game” technology platform integrates physical and digital play, adding new dimension to toys and video games, educational content, traditional storybooks and other entertainment mediums.

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Drive 1:1 personalization using omni-channel real-time data


Saved by uncleflo on April 4th, 2015.

DRIVE 1:1 PERSONALIZATION USING OMNI-CHANNEL REAL-TIME DATA. Deliver personalized experiences across channels and devices based on data from on-site, off-site, display, CRM, email, pixel and even offline data, all in real-time.

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Saved by uncleflo on February 22nd, 2015.

Everything You Ever Wanted to Know About Computer Graphics (But Were Afraid to Ask). You love Pixar movies and video games. You would love to learn how they are made and found some books on this topic at the library, but they are full of maths symbols you don't understand!

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Saved by uncleflo on September 19th, 2014.

Few days ago, Apple introduced iPhone 6 Plus. The new iPhone substantially changes the way graphics are rendered on screen. We've made an infographic to demystify this. The downscaling ratio is 1920 / 2208 = 1080 / 1242 = 20 / 23. That means every 23 pixels from the original render have to be mapped to 20 physical pixels. In other words the image is scaled down to approximately 87% of its original size.

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Aquatica announces Canon T2i/550D underwater housing :: Wetpixel.com


Saved by uncleflo on May 22nd, 2012.

When Canon announced the Rebel T2i/550D earlier this year, it turned some heads since it came relatively quickly following the T1i/500D. Many people also commented that it seemed like the 7Ds smaller sibling with the features it packed into a smaller body. Though Jean from Aquatica tipped his hand yesterday, today Aquatica today officially announced the AT2i housing for the Rebel T2i/550D. The announcement reveals some features divers will appreciate, such as a retractable lens release lever in order to be able to remove the camera body from the housing with both the lens and gear attached. The housing supports a variety of strobes - including Nikonos, Ikelite, S6 and fiber optical connections based on what you would like to use. The housing is one of the smallest and lightest that Aquatica has made, with a retail price of $1,999.

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PBM, PGM, PNM, and PPM: Summary from the Encyclopedia of Graphics File Formats


Saved by uncleflo on March 11th, 2012.

The Portable Bitmap Utilities (PBM) is a collection of programs organized, maintained, and primarily written by Jef Poskanzer. Although owned and copyrighted by Mr. Poskanzer, they are freely available in both source and executable form on the Internet and on many BBS systems. The "bitmap" in PBM is used in the older sense to refer to monochrome images. There are actually three other sets of programs encompassed by the PBM utilities. These are the Portable Greymap Utilities (PGM), the Portable Pixmap Utilities (PPM), and the Portable Anymap Utilities (PNM). PBM programs manipulate monochrome bitmaps, and PGM and PPM programs manipulate gray-scale bitmaps and color bitmaps, respectively. PNM programs operate on all of the bitmaps produced by the other programs. There is no file format associated with PNM itself. Most people call the overall set of programs PBM and the newer version pbmplus, however, and we'll follow this convention.

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