Thank you, those were exactly the answers I needed, and way more thorough than I could've hoped for.
-- Frank Gore Project Manager www.projectpontiac.com On Sun, Jan 17, 2010 at 5:03 PM, Larry Reeve <la...@polybytes.com> wrote: > LCMS does not have anything to do with the color space defined in the EXIF > block of a JPEG file. There is no embedded profile. It is up to the > application using LCMS to evaluate the color space definitions in the EXIF > and take the action to load and use an Adobe RGB profile if it is needed. > The DCF Optional Color Space (see paragraph 6.2 of of JEITA CP-3461 "Design > rule for Camera File system DCF Version 2.0") defines the values that should > alert an application to take this action: > > Color Space: Uncalibrated > WhitePoint X: 0.31 > WhitePoint Y: 0.33 > Chromaticity Red(X): 0.64 > Chromaticity Red(Y): 0.33 > Chromaticity Green(X): 0.21 > Chromaticity Green(Y): 0.71 > Chromaticity Blue(X): 0.15 > Chromaticity Blue(Y): 0.06 > YCbCrCoefficient 1: 0.30 > YCbCrCoefficient 2: 0.59 > YCbCrCoefficient 3: 0.11 > > Larry Reeve > >> -----Original Message----- >> From: Frank Gore [mailto:g...@projectpontiac.com] >> Sent: Sunday, January 17, 2010 3:40 PM >> To: lcms-user@lists.sourceforge.net >> Subject: Re: [Lcms-user] Pentax JPG and TIF Files >> >> On Sun, Jan 17, 2010 at 4:18 AM, Louis Solomon <lo...@steelbytes.com> >> wrote: >> > have you tried removing the whole exif chunk from the jpg? >> >> I guess that depends on whether I did it right. I used: >> mogrify -strip filename.jpg >> Does that remove just the EXIF metadata, or other stuff too? In any >> case, doing this did cause Photoshop to no longer recognize a color >> profile for this image. So I guess the color profile is only listed as >> part of the EXIF data after all and not embedded in the file (just >> like someone else mentioned already). >> >> On Sun, Jan 17, 2010 at 7:32 AM, Larry Reeve <la...@polybytes.com> >> wrote: >> > A DCF aware application sees this information and processes the image >> > accordingly (which means use an Adobe RGB profile). >> >> So does that mean the fault lies with the applications that use lcms, >> or with lcms itself? I'm not familiar with how lcms is used by >> applications. My understanding was that Gimp used lcms for color >> profile detection as well as color handling and conversion. Which part >> of the process needs to be DCF aware? >> >> -- >> Frank Gore >> Project Manager >> www.projectpontiac.com >> >> ----------------------------------------------------------------------- >> ------- >> Throughout its 18-year history, RSA Conference consistently attracts >> the >> world's best and brightest in the field, creating opportunities for >> Conference >> attendees to learn about information security's most important issues >> through >> interactions with peers, luminaries and emerging and established >> companies. >> http://p.sf.net/sfu/rsaconf-dev2dev >> _______________________________________________ >> Lcms-user mailing list >> Lcms-user@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/lcms-user > > ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
