I have 3 point and shoot Canon's for which I use CHDK I used the raw shooting capability to shoot CRW format images. These require processing with DNG2PS or similar to import the EXIF data from the matching JPEG and convert them into a usable DNG format. I've learned by reading this thread that DNG file in-camera might be a better approach, which I'll try. Raw is better for image data BUT loses the camera's internal automatic chromatic aberration and geometric distortion correction. This results in poor images thanks to the optics of a typical P&S. ELPH/IXUS and S3IS both had lots of optical issues visible in the RAW files. You can address this in Photoshop CS>5 by creating a camera profile using Adobe Lens Profile Creator (ALPC) and shooting calibration images in raw mode using CHDK. This is surprisingly time consuming AND due to the reduced sensor quality ALPC rejected about half of the images I shot, requiring a re-shoot (and conversion) and eventually generated partial profiles which I had to manually edit into a single complete profile by hand (due to a bug in ALPC). CameraRaw + ALPC lens profiles have a better lens correction result than in-camera so you can have your cake and eat it (after a large amount of work). The resulting profile is customised to that unique camera, so you'll get more accurate optical corrections than any lens profile downloaded from the internet or in-camera profiles can achieve. CHDK has proved valuable for shooting stereo (3D) images (with 2 identical cameras). There are CHDK variants especially for this purpose. CHDK motion triggers are great. Most software that runs when you insert an SD card into your computer will copy all of the CHDK files off of your card which is annoying. Even more so if it deletes them from the card automatically after completing the download! I recommend reading the above and weighing the benefits before you decide to try it.
Richard I also use Magic Lantern on my 5D Mk2 which is even more powerful and much more user-friendly than CHDK. It has none of the above drawbacks of CHDK. On Wednesday, 16 January 2013 06:04:59 UTC+10, Erik Krause wrote: > > Am 15.01.2013 10:21, schrieb paul womack: > > It's probably worth pointing out that due to the limited nature of > > most P&S digital to analogue converter that the RAW files > > You most likely mean analog to digital converter. > > > so generated are not quite as manipulable as the RAW > > file from a recent vintage DSLR. > > > > For the vast majority of purposes, it's better, even on a CHDK equipped > > P&S, to stay with JPEG. > > This might be true, especially since raw takes far longer to process. > However, raw is beneficial not only for dynamic range and white balance > adjustment (where your concern applies) but also for CA removal, which > is far better on raw data than on jpegs. > > -- > Erik Krause > http://www.erik-krause.de > -- -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to hugin-ptx+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
