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 12:16:53 -0700
Upon reading further, take the refund!
Cheers,
David
On Sep 20, 2013, at 12:13 PM, Spinnaker Photo Imaging Center <email@hidden> wrote:
> 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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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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