meta user
network profile
| bio | website | marksblog.com |
|---|---|---|
| location | Minnesota | |
| age | ||
| visits | member for | 2 years, 9 months |
| seen | Feb 4 at 22:17 | |
| stats | profile views | 50 |
I've been a software developer for a lot longer than I'm willing to admit. My current interests are C++ and Python on Windows, but I've been known to dabble in Linux and I try to be language agnostic when I can.
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Aug 30 |
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What are the best peak-fall landscape photography locations in the US? Don't forget the polarizing filter. |
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Apr 11 |
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What happened to Foveon sensors? @Kendall, just to be clear I'm using the term "pixel" here to represent the smallest addressable area on the image plane. I believe this is the definition from the dawn of digital imaging. The definition is independent of the color information available at each address. I hadn't realized the SD-1 was competitive in pixel addressing, I'd love to see the output. |
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Apr 11 |
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What happened to Foveon sensors? @Kendall, although each pixel of a Bayer array has a filter in front of it, they are still individual pixels with their own spatial characteristics. Sophisticated interpolation allows the red channel to incorporate information from the green and blue channels as well. |
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Apr 9 |
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What happened to Foveon sensors? Early Sigma cameras used JPEG compression settings (subsampling) that didn't show their sensor to the best advantage, but they fixed this. I wish I could remember where I had seen a quite graphic demonstration of the problem. |
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Apr 8 |
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How do I get a photo of the required 300dpi or for a 24x36" vinyl banner? The resolution field is intended for devices which have an actual physical resolution, such as scanners. The EXIF 2.2 spec is at exif.org/Exif2-2.PDF, have a look at page 19 (which is page 25 of the PDF). |
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Apr 8 |
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How do I get a photo of the required 300dpi or for a 24x36" vinyl banner? The value of 72 is actually mandated by the EXIF standard. Who lets you change it? |
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Mar 25 |
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How do camera body motors compare to in-lens motors for focusing? Can't agree with the assertion that an in-body motor means all lenses work at the same speed. Don't know if it's due to gearing or what, but some lenses are faster than others even within the same category. |
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Mar 20 |
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What is the difference between the two Pentax 50-200mm DA lenses? @mattdm, it's understandable that the factory would be stuck with old stock when a better version came out at the same price. I'd guess they're forced by contractual obligation to offer them at list price. |
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Feb 11 |
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How is the YCbCr color space represented in a JPEG image? Sorry, I didn't mean to imply that the subsampling causes the artifacts. It's just that the existing errors from quantization get blown up 2X, making them much more visible. I think it's important to know that the visible effect of subsampling is more than just a little added fuzziness. |
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Feb 8 |
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How is the YCbCr color space represented in a JPEG image? Chroma-subsampling doesn't just result in "loss of resolution". It introduces very noticeable artifacts especially in the red channel. |
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Feb 8 |
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How is the YCbCr color space represented in a JPEG image? @thomasrutter, Photoshop picks the subsampling based on the quality setting you choose. It's not an independent option. |
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Feb 3 |
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Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR? @Matt, Canon is a special case because they make their own sensors and even the least popular ones sell in great volumes, just because they're Canon. The other sensor makers concentrate on the ones that are a sure thing. |
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Dec 10 |
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How to start the basics of photography, which is the best entry level SLR camera? +1 for Take lots of images and Experiment. That is surely the best way to make the most of your equipment. |
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Oct 18 |
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Where can I find comparisons for linear polarizers (for a cheap variable ND filter)? Do you have a link to Pentax's claims that a Linear Polarizer is OK? |
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Oct 9 |
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What are my best options for a tripod for up to $100? I'm sure he meant ruing as in rue the day. |
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Sep 22 |
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How can I better organise and file my photos? The best way is with the Delete button. Now if I could only follow my own advice... |
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Sep 18 |
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How do I correct white balance in JPEG images? @Rowland, I should also mention that there are other methods in Paint Shop Pro that might be simpler, but I prefer this method as it gives the most flexibility. The Manual Color Correction feature is hidden in later versions, you need to customize the menu or toolbar to bring it back. |
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Aug 23 |
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What file system are memory cards formatted with? FAT16 had fewer patent issues so it was preferred for the smaller cards. |
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Aug 20 |
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The right way to delete all photos from a camera The camera manual will always recommend using the camera to format the card, as that's the only process they have any control over. Doesn't mean other methods aren't just as good. |
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Aug 20 |
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Good examples of RAW's advantages over JPEG? The conversion from RAW to JPEG not only reduces the number of bits but it changes from linear to logarithmic representation. Since our visual response in the eye is also logarithmic, you lose less from this process than the numbers suggest. |
