Open

by damned truths

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

1,202 reputation
412
bio website vyznev.net
location Helsinki, Finland
age
visits member for 3 years, 5 months
seen Dec 20 at 2:45

I'm a PhD student in biomathematics, working on stochastic individual-based models of evolution in spatially structured populations. My other interests include cryptography, programming games and puzzles, photography and graphic design.


I'm the main author and maintainer of the Stack Overflow Unofficial Patch (SOUP), a user script for browsers with GreaseMonkey-compatible user script support (Firefox, Chrome, Opera, possibly Safari) that fixes or works around a number of outstanding issues with the Stack Exchange user interface.

I tend to answer a lot more questions than I ask. Some answers I'm rather proud of:

CC-Zero Please consider any (original) code I post to Stack Overflow and other Stack Exchange sites to be released under CC-Zero unless stated otherwise. You may do whatever you want with it and don't have to credit me in any way, although of course that would be nice.


Dec
15
comment Should I store unedited/raw, edited, or watermarked images while backing up on DVD/CD?
@JamesSnell: That depends on how much you trust your preferred editor to remain available in the future, and to retain support for old versions of its native file format. PhotoShop will probably still be around in 10 years, but maybe not in 50. JPEG decoders, however, will be around as long as modern civilization survives. (TIFF is a bit of a fuzzy case, since you can put almost anything inside a TIFF container, but as long as you stick to well supported storage formats, it should be fine too.)
Nov
13
comment Does a “body-only” DSLR need a lens added before use?
@ConorBoyd: You can always comment on your own questions/answers, and on answers to your own questions, but otherwise it requires 50 rep. You can vote up with just 15 rep, though, which is what you should do if you have nothing substantial to add to earlier answers. That said, Chris, your answer does have something new in it, so here, have an upvote. :-)
Oct
31
comment Does simply opening and closing a JPEG file decrease image quality?
Actually, AIUI, both JPEG compression and decompression can be (somewhat) lossy. That is to say, you cannot exactly reconstruct the original image from the compressed data, and you cannot (always) exactly reconstruct the compressed data from the decompressed image. Mostly, AFAIK, this can happen due to clipping: when mapping the compressed YUV DCT coefficients back to 8-bit RGB pixel colors, some pixels might end up with color values less than 0 or greater than 255, which will be clipped.
Sep
24
awarded  Autobiographer
Sep
6
answered What causes the glitter/texture in bokeh?
Sep
6
revised What to look for in a compact camera to take picture of black dog?
added 605 characters in body
Sep
6
revised What to look for in a compact camera to take picture of black dog?
added 227 characters in body
Sep
6
answered What to look for in a compact camera to take picture of black dog?
Jul
29
awarded  Yearling
Jul
23
comment How to remove texture from old scanned photos?
While some of the answers (like this one) to the other question might indeed be applicable here too, I don't believe this is really a duplicate. The type of texture in this image is different, and, in particular, the FFT method suggested in the accepted answer to the other question is likely to be useless here.
Jul
21
revised How to photograph sparkly objects?
added 1088 characters in body
Jul
21
answered How to photograph sparkly objects?
Jun
19
comment How do I create a nighttime B&W image but have the subject illuminated by light in full color?
@JaredCravens: What I'd do is open both images as layers in Photoshop / GIMP, align them carefully with the no-spotlight image on top, set the top layer's blending more to Subtract and merge them. This should give a layer showing only the parts of the image illuminated by the spotlight. This layer can then be placed on top of a grayscale copy of the no-spotlight layer, with the blending mode set to Addition / Linear Dodge, to restore the spotlight with colors intact.
Jun
19
revised Long exposure photoshop?
add transparent PNGs
Jun
18
comment Long exposure photoshop?
@WarrenYoung: I just removed the solid black layer that I had added between the edited layer and the original. The actual blurred layer is semitransparent; I'm just using a black background because JPEG doesn't do transparency (and it'd look awful here on the light page background anyway). I suppose I could upload it as a transparent PNG, but it'd be huge at full size.
Jun
18
answered Long exposure photoshop?
Jun
18
awarded  Citizen Patrol
Jun
18
comment What is the best way to remove texture from a scanned textured photo paper? details
I think I know what caused the error you got, and I've posted an explanation below (and edited the original answer to hopefully eliminate this potential for confusion). However, now that the problem has been solved and the original answer clarified, I feel that this question should be closed (and eventually deleted), as it's essentially just extended commentary on the earlier answer.
Jun
18
awarded  Excavator
Jun
18
revised What is the best way to remove texture from a scanned textured photo paper?
add clarifying note per http://photo.stackexchange.com/questions/52134/what-is-the-best-way-to-remove-texture-from-a-scanned-textured-photo-paper-deta/52138#52138