On Tue, Jun 10, 2008 at 7:53 AM, Detonn <ride3
...@ride.ri.net> wrote:
> Well I just recieved the new color checker and it didn't work with the
> dng file because I got strange results and one of the numbers was
> 100. Next I'll test it out with my Canon 20D because that should open
> in CS2. If that works I'll have to buy the next version of Photoshop.
> Thanks
> Gary
> On Jun 6, 2:16 am, "Steve Sprengel" <st...@sprengels.com> wrote:
> > Every new camera model has potentially a different light-response curve
> as well as potentially embedding new fields in the RAW file format; so ACR
> has to specifically be updated for each new camera model. Adobe stops
> updating ACR when a new version of Photoshop comes out with its new flavor
> of ACR and your camera is just newer than the last version of ACR that came
> with CS2.
> > --
> > Presumably you are wanting to use your script-computed calibration with
> Lightroom?
> > When you create your new camera's DNG in the current free DNG converter
> that does understand the RAWs from your new camera and then open that DNG in
> CS2's ACR that does not understand your camera's RAWs, you will see that the
> profile is labelled "Embedded".
> > What I'm not sure is if that Embedded profile in the DNG IS the camera
> profile or whether it has been manipulated to make it more standard or
> generic. If it IS your camera's profile then running the calibration-script
> in CS2 should produce the correct slider values. However if it is something
> that isn't the same as your camera's profile, then running the script would
> not produce the values needed by Lightroom which is using a RAW engine that
> does know about your camera.
> > You can probably test to see if Lightroom and CS2's ACR both produced the
> same results from your DNG by opening the DNG in each, saving the result as
> a PSD or TIF (so there's no loss due to compression like there would be with
> a JPG) and then loading each of those images into Photoshop layers and set
> the blend-mode to difference--which should look almost completely black if
> they are similar, flatten the image so there is only one layer, then open
> Levels and drag the high-light slider down close to zero (the black end) and
> see if any detail starts to show up. If not then your CS2 and LR DNG
> conversions are identical and you're probably ok in using CS2 to compute
> your calibration from the DNG.
> > In ACR and LR you need to turn off the sharpening and noise-suppression
> otherwise there will be differences just caused by those operations.
> > ----- Original Message -----
> > From: Detonn
> > To: AcrCalibrator
> > Sent: Thursday, June 05, 2008 8:37 PM
> > Subject: [acrcal] Re: ACR Calibrator Problems
> > Again Thanks for the info. I would have never know that CS2 could
> > not open my raw files if it wouldn't have been for attempting this
> > calibration because I always use Lightroom to process my raw files.
> > But it does open the dng file with ACR 3.7 so hopefully the script
> > will work correctly this time.
> > Gary
> > On Jun 5, 9:20 pm, "Steve Sprengel" <st...@sprengels.com> wrote:
> > > The script works the same with DNGs as RAWs if the version of CSx's ACR
> version also supports the DNG's underlying RAW file format...in other words
> if you can open the RAW in Photoshop you can use a DNG or RAW
> interchangeably.
> > > You are wanting to use the DNG from a new DNG-converter with an older
> ACR.
> > > From some experimentation when the 40D came out, I can tell you the
> script-computed calibration for a DNG with RAW format that is unsupported by
> ACR is different than the script-computed calibration for a DNG where the
> RAW format is also supported by the version of ACR.
> > > I would recommend keeping up-to-date with Photoshop versions instead of
> doing the new-DNG/old-ACR hack, but it may work ok, I don't know because I
> don't do things that way.
> > > ----- Original Message -----
> > > From: Detonn
> > > To: AcrCalibrator
> > > Sent: Thursday, June 05, 2008 7:30 PM
> > > Subject: [acrcal] Re: ACR Calibrator Problems
> > > Thanks for the information. I'll buy the other color checker. Will
> > > this script work on a dng file. I can't open the .cr2 file with CS2.
> > > Gary
> > > On Jun 4, 11:38 pm, "Steve Sprengel" <st...@sprengels.com> wrote:
> > > > The 24-patch GMB/XRite Color Checker (and mini variation) is the only
> calibration target that the Fors and Tindemans scripts work with.
> > > > A Q60 has more colors in different positions so unless the target you
> are using has a small embedded CC-colored array like the CC SG and you use
> the path-tool to mark just that little area, it will not work at all.
> > > > I believe Rags has a variation of the script that will work with the
> Q60-type targets but you have to specify the three colors to use and I have
> never used it so don't know how easy or hard it is.
> > > > For reference a Color Checker looks like this:
> http://www.babelcolor.com/main_level/ColorChecker.htm
> > > > And costs around $70 for the full-sized one, and a little less for
> the mini:
> http://www.bhphotovideo.com/c/product/465286-REG/Xrite_MSCCC_Original...
> http://www.bhphotovideo.com/c/product/465287-REG/Xrite_M50111_Mini_Co...
> > > > ----- Original Message -----
> > > > From: Detonn
> > > > To: AcrCalibrator
> > > > Sent: Wednesday, June 04, 2008 8:30 PM
> > > > Subject: [acrcal] ACR Calibrator Problems
> > > > Hi
> > > > I'm trying to calibrate my Canon 40D with the Kodak q60 target and I
> > > > keep getting 100s or -100 which I've read is an error.
> > > > I photographed the target with a studio strobe.
> > > > I opened it with ACR and change it to 8 bits along with the smallest
> > > > file size and profoto. I had to convert it to an adobe dng file to
> > > > open it with ACR.
> > > > Then I used the pen tool and went from the top left corner to the
> > > > bottom left then over to the bottom right then to the top right.
> > > > Any ideas why?- Hide quoted text -
> > > > - Show quoted text -- Hide quoted text -
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> > - Show quoted text -
