Re: X-Rite Passport Inaccuracies
Re: X-Rite Passport Inaccuracies
- Subject: Re: X-Rite Passport Inaccuracies
- From: Spinnaker Photo Imaging Center <email@hidden>
- Date: Fri, 20 Sep 2013 12:13:35 -0700
Justin: First, I learned some years back, X-Rite's software is useless for me!..For me, I emphasize. A colleague explained I should be using Adobe DNG profile editor. It is free. Not just download free, but use for free.
When I started using DNG profile editor color management was much better.
Now, even better yet, for camera profiling, Raw Photo Processor 64 includes profiling. And this is far better than DNG profile editor. RPP 64 is only for Macs.
Cheers
David
On Sep 20, 2013, at 9:18 AM, Justin Krug <email@hidden> wrote:
> I was directed here by a helpful photographer whom I contacted regarding
> my issues with the X-rite Passport. My primary purpose for using it is
> to get accurate and consistent colors across different ambient and
> artificial light sources for architectural photography. For example, I want the colors in the photo taken with ambient/artificial mixed light to match with those taken under CFL's at night. Also, I wanted
> to use it to match color between cameras. On both counts, it has
> failed, and when I subjected it to a test using the reference values
> available on X-rite's website, it did not perform well. I would like to
> get some feedback from experienced members here regarding my findings
> and the response I received from X-rite after sending them details of my
> testing.
>
> Here is an outline of my test:
> 1) I took the photo
> of the X-rite Passport under overcast daylight (no artificial light)
> with two cameras, the Canon 5d and Canon 60d.
> 2) Then I created custom profiles from each photo using the X-rite Passport software.
> 3) Next, I applied the custom profile to each photo of the Passport
> 4) White balance was corrected in ACR by clicking the WB on the square two over from black (#22)
> 5)
> Both photos were loaded into Photoshop and color sampler points were
> applied to the blue, green, red, and yellow squares (#'s 13,14,15,16)
> 6) The image was converted to Lab color and the a and b values were compared against the reference values on X-rite's website.
> 7) The same process was repeated for the photo from each camera using the Adobe Standard profile
>
>
> What
> I discovered was that the color was just as accurate if not more
> accurate in the Adobe Standard profile. Also, the colors did not match
> between the Canon 60d and 5d after applying the X-rite profiles.
> A couple sample points from the Canon 5d (again, a,b values):
> Daylight
> overcast test-- X-rite: red a,b= 69,41; Adobe Std: red a,b= 61,37;
> Reference (rounded to nearest whole number): red a,b=53,28.
> X-rite: green a,b=-51,39; Adobe Std: green a,b=-47,36 Reference: green a,b= -38,31
>
> I
> did the same test under artificial light (CFL I think) and the results
> were a little closer between the Adobe Standard and the X-rite, but for
> $100 and promises of accurate color, I was very disappointed.
>
> After
> contacting X-rite, and sending over my findings and photos, I waited
> over a month to hear back, after their engineers were going to review my
> results. The response I received was surprising. X-rite said "To make
> a long story short, your standards for performance and data analysis
> would not be well suited to use ColorChecker Passport and its DNG
> profiles." And also "ColorChecker Passport software was designed to be a
> simple camera profiling solution for casual and non-professional
> photographers..." The recommendation was that I use an ICC profile as
> opposed to a DNG profile. They also offered me a refund on the
> Passport.
>
> What do you think of my test and X-rite's response?
> Have you conducted your own objective testing? I don't need perfect
> color, but I do want consistent and accurate looking color. Thanks in
> advance.
>
> -Justin Krug
>
>
>
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David B Miller, Pharm. D.
member
Millers' Photography L.L.C.
dba Spinnaker Photo Imaging Center
Bellingham, WA
www.spinnakerphotoimagingcenter.com
360 739 2826
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