Re: [darktable-user] dust cleaning
Thank you, I will check this... yes - it is scary to clean it... I admit... but your email is encouraging... Regards, B On 2016-09-06 12:26 PM, Matthieu Moy wrote: - Original Message - Cleaning the sensor is good however - the issues are - if the camera is under warranty and the blower does not do the job only wet cleaning is the solution (this voids warranty). No, wet cleaning is not the only solution. I never tried wet cleaning, but I saw many people dis-recommending it. OTOH, I did use a cleaning "pen" like this one http://www.missnumerique.com/lenspen-sensor-klear-ii-p-6470.html?utm_source=google&utm_medium=comparateur1&utm_campaign=google346&ref=7077ncappla&gclid=Cj0KEQjw0rm-BRCn85bm8uS-zK0BEiQAHo4vrDUALPRJUfTY3tlkjHNFeGWI210Ba1iRQWc0R79JA4kaAn0o8P8HAQ and it did work pretty well. One common misconception is that sensor cleaning is about cleaning the sensor ;-). Actually, you're cleaning the anti-reflective coating on top of the IR and/or anti-aliasing filter in front of the sensor, which is far more robust than the sensor itself. Essentially, it's as hard as a lens. Even if the warranty is over - the options are - send to manufacturer, sent to a shop or do it yourself. Some times (if on a trip for example) The pen above fits in your camera bag as well as the lens cleaning kit you already have. Sure, if you don't have it at hand when needed, it's not an option, but the "trip => no cleaning possible" is not exactly true either. Note: I'm not arguing that better support for dust removal in dt wouldn't be cool, just that sensor cleaning is not _as_ scary as it could be (still scary, though ;-) ). darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] dust cleaning
- Original Message - > Cleaning the sensor is good however - the issues are - if the camera is > under warranty and the blower does not do the job only wet cleaning is > the solution (this voids warranty). No, wet cleaning is not the only solution. I never tried wet cleaning, but I saw many people dis-recommending it. OTOH, I did use a cleaning "pen" like this one http://www.missnumerique.com/lenspen-sensor-klear-ii-p-6470.html?utm_source=google&utm_medium=comparateur1&utm_campaign=google346&ref=7077ncappla&gclid=Cj0KEQjw0rm-BRCn85bm8uS-zK0BEiQAHo4vrDUALPRJUfTY3tlkjHNFeGWI210Ba1iRQWc0R79JA4kaAn0o8P8HAQ and it did work pretty well. One common misconception is that sensor cleaning is about cleaning the sensor ;-). Actually, you're cleaning the anti-reflective coating on top of the IR and/or anti-aliasing filter in front of the sensor, which is far more robust than the sensor itself. Essentially, it's as hard as a lens. > Even if the warranty is over - the options are - send to manufacturer, > sent to a shop or do it yourself. Some times (if on a trip for example) The pen above fits in your camera bag as well as the lens cleaning kit you already have. Sure, if you don't have it at hand when needed, it's not an option, but the "trip => no cleaning possible" is not exactly true either. Note: I'm not arguing that better support for dust removal in dt wouldn't be cool, just that sensor cleaning is not _as_ scary as it could be (still scary, though ;-) ). -- Matthieu Moy http://www-verimag.imag.fr/~moy/ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] dust cleaning
The concept of Canon is interesting. They collect dust data (small amount of information) and store it in the camera. Then (to my understanding) they append it to .CR2 and .JPG The photo professionals is expected to extract this data and use it to approximate the area. I think this have been brought up before https://www.mail-archive.com/darktable-devel@lists.sourceforge.net/msg02120.html https://redmine.darktable.org/issues/8422 I can observe it in a very particular situation but when did observed is very consistent. When long exposure is taken usually the aperture is very much closed - so the chance of the dust being there is extreme. Especially if located on the top of the screen (where the sky is). Cleaning the sensor is good however - the issues are - if the camera is under warranty and the blower does not do the job only wet cleaning is the solution (this voids warranty). Even if the warranty is over - the options are - send to manufacturer, sent to a shop or do it yourself. Some times (if on a trip for example) no solution would work. Since the camera collects the data and attaches to the image - it makes sense that this can be used. Last but not least - the process repeats since all DLSR would attract dust. I am not sure however how many cameras have a tool to deal with it (like collect dust information). The dust is always slightly darker blurred spots. Some info below http://cpn.canon-europe.com/content/education/infobank/capturing_the_image/sensor_cleaning.do Regards, B On 2016-09-06 01:18 AM, junkyardspar...@yepmail.net wrote: On Tue, Sep 6, 2016, at 01:09, Jason Polak wrote: Interesting problem. I would of thought it possible to at least draw the masks for the spot removal module and save it as a preset, but I just tried it and it's not possible to save drawn masks as a preset, most likely because it depends on the exact dimensions of the imported image. Maybe someone can make a Lua script that does this? The problem with this approach is that the spot removal module "clones" the image info from another area over the selected spot, and the appropriate area to use for this varies from image to image. darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] dust cleaning
On Tue, Sep 6, 2016, at 01:09, Jason Polak wrote: > Interesting problem. I would of thought it possible to at least draw the > masks for the spot removal module and save it as a preset, but I just > tried it and it's not possible to save drawn masks as a preset, most > likely because it depends on the exact dimensions of the imported image. > Maybe someone can make a Lua script that does this? The problem with this approach is that the spot removal module "clones" the image info from another area over the selected spot, and the appropriate area to use for this varies from image to image. -- jys darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] dust cleaning
Hi! Interesting problem. I would of thought it possible to at least draw the masks for the spot removal module and save it as a preset, but I just tried it and it's not possible to save drawn masks as a preset, most likely because it depends on the exact dimensions of the imported image. Maybe someone can make a Lua script that does this? (Note I'm not even sure how to use this feature so it might not be possible). Or, you can get your sensor cleaned...something I've still not got around to doing! Jason On 16-09-06 07:31 AM, I. Ivanov wrote: Hi Guys, I have some small spots on the pictures that appear to be always at the same area and are mainly visible on long exposures. If I understand correctly - Canon has a way to collect dust data and somehow clean these areas (my guess is by approximating the pixels). Is there a way to do a similar thing with DT? Regards, B darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] dust cleaning
- Original Message - > I have some small spots on the pictures that appear to be always at the > same area and are mainly visible on long exposures. Try taking pictures of uniform background (e.g. clear sky), out of focus, with narrow aperture. If you see these spots more strongly in these conditions, and consistently at the same location, they're probably dust on the sensor. It's actually not that hard to remove (either pay ~ 50$ in a shop, or buy a 20$ kit and do it yourself). Your favorite search engine is your friend. > If I understand > correctly - Canon has a way to collect dust data and somehow clean these > areas (my guess is by approximating the pixels). Is there a way to do a > similar thing with DT? dt has "hot pixels" to discard and approximate _pixels_ that are way off (typically dead pixels), but a spot due to dust covers many pixels and darktable won't be able to remove that automatically. One important property of dt is that the resulting image depends only on the RAW file and the content of the database (or the xmp file), and the "dust removal by keeping an image of where dust is" doesn't fit well in this model. Obviously, you still have the « spot removal » tool, but you need to remove each spot by hand. -- Matthieu Moy http://www-verimag.imag.fr/~moy/ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
[darktable-user] dust cleaning
Hi Guys, I have some small spots on the pictures that appear to be always at the same area and are mainly visible on long exposures. If I understand correctly - Canon has a way to collect dust data and somehow clean these areas (my guess is by approximating the pixels). Is there a way to do a similar thing with DT? Regards, B darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
