I'm getting some raw+jpeg from a Canon 5D MK IV. I will tell you when I will have looking in them.
You *suppose* that "in-camera lens correction in Canon cameras doubles the RAW file size". In fact in the 5D Mk IV, the raw is the same size. It double when you use the "dual pixel raw" which contains informations that allow to do some kind of focus micro adjusments in post-production. If I take a shoot in RAW only, I get a RAW. Then I go to in-camera processing to get a JPEG. I click the lens icone to have the lens corrections applied. When done, I get A JPEG but the RAW has not been modified. Jena-Luc 2017-11-15 13:35 GMT+01:00 Heiko Bauke <heiko.ba...@mail.de>: > Hi, > > Am 15.11.2017 um 12:28 schrieb Roman Lebedev: > >> On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke <heiko.ba...@mail.de> wrote: >> > [...] > >> Contrary to the common believe that in-camera >>> corrections are applied to JPEGs but not to the RAW file, in-camera lens >>> correction in the EOS-1D X Mark II is applied to RAWs only. See >>> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-le >>> ns-aberration-correctiona-close-up-look-part-1 >>> >> >> Can you quote that part where it says what you think it says? >> I don't see anything there about modifying the raw files. >> > > the article is about in-camera lens correction. Lens corrections are > stored in the image data, it's not about storing meta data for lens > correction in post processing. Do not be confused by the fact that there > is also a software tool provided by Canon that implements the same kind of > lens correction algorithms for post processing. > > The term RAW file is not included explicitly in the article that I > mentioned. It is, however, highlighted that »The Digital Lens Optimizer > [...] made its debut as an in-camera feature on the EOS-1D X Mark II. At > that time, its effects could not be reflected in real time on JPEG > images.« I understand this statement as that the RAW file image data is > affected. The camera has a special hardware component to do the heavy > math. This would not be needed if just some meta data for lens correction > in post would be included into the RAW file. > > Furthermore, another Canon article (see https://snapshot.canon-asia.co > m/article/en/eos-1d-x-mark-ii-in-camera-lens-optimization- > for-high-quality-images ) says > > »The processing ability of the Dual DIGIC 6 + image processing engines is > what makes in-camera image processing possible. They are capable of > processing the vast amount of data that is yielded from the 20-megapixel > sensor and the continuous shooting speed of 16 fps at a high speed, and > achieve in-camera RAW image development and real-time aberration > correction. A dedicated IC has been developed and employed to enable the > incorporation of different aberration correction features during in-camera > RAW image.« > > How would you understand »in-camera RAW image development«? It does > definitely not refer to the lens correction to the JPEG, because this > camera does not have such a feature. > > According to https://photo.stackexchange.com/questions/35324/why-does-usi > ng-canons-digital-lens-optimizer-double-the-size-of-a-raw-file > in-camera lens correction in Canon cameras doubles the RAW file size, > because the processed image data is stored in addition to the unprocessed > RAW data. > > > Heiko > > > -- > -- Number Crunch Blog @ https://www.numbercrunch.de > -- Cluster Computing @ http://www.clustercomputing.de > -- Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke > -- Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
