GBALLARD

Suspected Photoshop PDF BUG

by Gary Ballard, a professional photographer in San Diego with an interest in understanding basic color-management work flows | ADOBE® ACROBAT© are registered trademarks of Adobe Systems, Inc.
February 2013

Why Adobe Acrobat Pro's "Convert Colors" destroys my RGB & CMYK colors

My first workflow tests proved Acrobat cannot properly Convert even one Tagged Photoshop PDF image properly (unless that image was saved in Acrobat's default Working Space) — so users beware if you don't understand how Convert Colors works because this is a Major Gotcha!

In general, my tests will prove:

  1. Acrobat's Convert Colors ignores embedded RGB and CMYK profiles in Photoshop PDF,
  2. Acrobat's Convert Colors "Assume" Acrobat's Working Profile, and
  3. then Acrobat color management system (CMS) Converts to the Destination space (i.e., Acrobat's "Conversion Profile").

This will be very easy to observe in my Convert Colors tutorial screenshots, printscreens, and it brings into question the accuracy of Acrobat and Photoshop monitor proofing, desktop printing on wide format printers like Epson Stylus Pro series, and even proofing for offset printers.

Before I get started, this issue has been resolved and concluded to be an Acrobat or Photoshop PDF bug.

SEE MY BUG-FREE SUCCESSFUL 2ND WORK FLOW TUTORIAL if you want to learn how to properly Convert Colors in Acrobat Pro, OSX Mac or Windows versions — including how Acrobat reacts to Tagged and Un-tagged elements.

I am leaving this color troubleshooting tutorial up for those users having problems with Photoshop PDF file format because it demonstrates some pretty agressive troubleshooting techniques and excellent examples, screenshots, of ICC profiles in action.

The lesson here is do not trust Acrobat Convert Colors using Photoshop PDF:

This issue is most likey a BUG with the Photoshop PDF and/or how that file format interacts with Acrobat color management: View> Tools> Print Production> Convert Colors.

Professional color consultant Andrew Rodney confirmed the bug using my Photoshop .pdf and then pointed me to problems with Photoshop PDF and/or Acrobat. I redid the test in InDesign> Export PDF and that resolved the issue (taking Photoshop PDF out of the workflow)... Thank you, Andrew.

PHOTOSHOP .PDF Original (DOWNLOAD)

This is my first original test workflow using Photoshop PDF — you will see it has some serious issues with Photoshop PDF....

Here is a screenshot of my Acrobat Preferences> Color Management> Working Spaces set to sRGB (set these settings if you are trying to follow this example):

If you open my original CONTROL PDF in Acrobat (with its Preferences> Color Management> Working Spaces set to sRGB) it will display like the following example (unless you have a wide-gamut monitor, in which case the Untagged set will probably have a more reddish appearance, but the Tagged set will display correctly because Acrobat's display is color managed like Photoshop):

PHOTOSHOP PDF

ABOVE SCREENSHOT IS DISPLAYING CORRECTLY (as expected)

THE FIVE IMAGES IN THE LEFT COLUMN ARE IDENTICAL to the five images in the right column except ICC profiles have been embedded in the Tagged set, and the profiles were "stripped" or removed from the Untagged set.

LEFT SIDE: The left column containing the five Tagged images display correctly (matching Photoshop) because Acrobat's color management system (CMS) "Adobe (ACE)" is reading their embedded ICC profiles and Converting (transforming) their colors to Monitor RGB for accurate display.

RIGHT SIDE: The right column containing the five Untagged images display predictably wrong because, in the absence of an embedded profile, Acrobat is "Assuming" its default Working RGB profile sRGB. Note: sRGB is displaying correctly because Acrobat made the correct Assumption — sRGB is Acrobat's default Working RGB in this example (see my above Acrobat color settings).

In other words, when I made my screen shot (Print Screen under Windows):

  1. The Tagged set in the left column were being properly color managed: Source Profile> Monitor Profile.
  2. The Untagged set in the right column were obviously not correctly managed — for all practical purposes — Acrobat "Assigned" sRGB (its default Working RGB).

My goal of a proper color-managed conversion is to have all the Tagged images in the left column display correctly in a Converted PDF.

CHANGE ACROBAT'S WORKING RGB
observe the Untagged images

These two examples will prove my theory that Acrobat "Assumes" its default Working Profile for Untagged elements.

Change your Working RGB and Destination profiles to an extreme color space so any problem will be impossible to miss.

Set Acrobat Working RGB to "ProPhoto RGB" go to Acrobat> Preferences> Color Management for this screenshot and make the change (then Quit Acrobat and reopen my original PDF):

ACROBAT COLOR SETTINGS

You should now see huge changes in the right column — Acrobat is no longer Assuming sRGB on Untagged images because you changed its Working RGB to ProPhotoRGB — however — notice that the Untagged ProPhotoRGB now "matches" the Tagged set (because Acrobat is making the correct Assumption, its default Working RGB is ProPhoto in this example).

ACROBAT DEFAULT COLOR DISPLAY

An interesting observation in the above screenshot is only the Untagged ProPhoto RGB "matches" the Tagged set (because Acrobat's default RGB profile, it's Working Space, is ProPhoto RGB).

SEE AN EVEN MORE BIZARRE EXAMPLE

Set Acrobat Working RGB to "Whacked RGB" (you will have to have that ICC profile installed to select it) or take my word for it:

ACROBAT WORKING SPACE RGB

Then Quit Acrobat and reopen my original PDF — you should see this:

BAD COLORS IN ACROBAT

Notice only the Untagged Whacked RGB is displaying proper like the Tagged set (because I changed Acrobat Working RGB to Whacked RGB in my Acrobat preferences (see above screenshot).

AGAIN: This is happening because Acrobat "Assumes" (Assigns) its working profile on Untagged images. This is extremely important to understand if you need to visually PROOF a PDF on the monitor AND/OR if you need to Convert to a Print Space because all color Conversions will be off, including Source> Monitor and Source> Print Space.

In other words, if I sent you a PDF that contained Untagged WhackedRGB images — and your Acrobat Working RGB profile is sRGB — Acrobat would display my images blue, and Convert to print space blue.

The point I am exhausting here is — unless you are embedding profiles in Acrobat PDF and using those profiles to Convert to Monitor RGB and Print Profiles — you are either hosing other people's colors on a daily basis, or you are getting lucky that their Source profiles are close enough to your default spaces that no one know why their color isn't just right.

EMBEDDING ICC Profiles versus not embedding Profiles (and packaging RGB for the correct destination space):

The above example demonstrates a critical point about embedding profiles for use in color-managed work flows (if you want them to display and print correctly) — and it also makes a convincing point about learning how to Convert Photoshop documents for use in un-managed workflows.

For example, a person opening my PDF downstream will only be able PROOF — on the monitor or print — (or Convert) my Untagged RGB images faithfully in Acrobat or Photoshop if his Working Space is using (it Assumes) the same color space as my Untagged image (or if he Assigns my profile in Photoshop).

This really is not as confusing as it sounds once we have a working knowledge of how profiles react in our applications — it is very clear and predictable.

I really like using ProPhoto and Whacked RGB images in my examples because they are so obvious when the wrong profile is Assigned or Assumed (or ignored).

In Photoshop, "Assume" has the exact same effect as Edit> Assign Profile> Destination Space: (Acrobat's Working RGB profile).

Return your Acrobat> Preferences> Color Management> Working Spaces> Working RGB to "sRGB"

SET UP A STANDARD CONVERSION IN ACROBAT

This is my best guess for setting up a simple Photoshop-style Source> Destination profile conversion. I asked for help on Adobe's Acrobat forum, but no one seemed to know how to do it using my example, what I might be missing....

In Acrobat go to: View> Tools> Print Production> Convert Colors dialog, and select Convert Command: Convert to Profile; Conversion Profile: WhackedRGB.icc; Rendering Intent: Perceptual; check Embed profile.

If you do not have a copy of the WhackedRGB.icc, Google a download, or use ProPhotoRGB profile.

ACROBAT CONVERT COLORS SETTINGS

At this point click on OK and File> Save As a copy, close and reopen it — my results looked like this:

Note: This display behavior proved to be a bug with either the Photoshop PDF images or how Acrobat interacts with them in Convert Colors (this is not normal).

BAD PHOTOSHOP PDF COLOR CONVERSIONS

The above screenshot is the smoking gun — easily proven in Photoshop.

Acrobat Convert Colors:

  1. IGNORED (stripped) the five embedded profiles,
  2. "Assumed" its Working RGB (sRGB) for all 10 images,
  3. "Converted" them to its Destination profile (WhackedRGB), and
  4. embedded the WhackedRGB ICC profile.

This behavior is crystal clear because each Tagged/Untagged pair "match" and each pair is uniquely different in appearance from the other pairs — sRGB is the only Tagged/Untagged pair displaying proper (so sRGB is the profile Acrobat is Assuming).

BUT TO DRIVE HOME MY PROOF (open the five tagged converted images in Photoshop):

I opened the Converted Colors .pdf (its five-Tagged files) in Photoshop "Use the embedded profile (instead of the working space)" option for each image.

The embedded profile was Whacked RGB as it was my targeted Conversion Profile in Acrobat's Convert dialog (see above screenshot).

The results (the screenshot below) irrefutably substantiate my conclusion:

  1. Acrobat "Convert Colors" ignored my five embedded profiles,
  2. It "Assumed" its default working profile (sRGB) on all 10 images,
  3. It Converted all 10 images to Whacked RGB, and
  4. It embedded its Destination (Conversion) Profile.

Note: This behavior proved to be a bug with either the Photoshop PDF images or how Acrobat interacts with them in Convert Colors (this is not normal).

Notice each image's original Tagged profile, and the Document Profile Photoshop is using (Whacked RGB) — these are really bizarre results — color management is totally broken... I don't know how anyone could argue otherwise.

ASSIGN CONVERT PROFILES

Simulating the above set in Photoshop is easy using my original set of five Tagged Getty PDI test .jpg images:

  1. Open each original Tagged file (use embedded profile),
  2. Edit> Assign Profile: sRGB,
  3. Edit> Convert to Profile> Destination Space: Whacked RGB
  4. Save with embedded Whacked RGB ICC profile

That will reproduce the same appearance, using the same Document profile, as my above screenshot.

SO WHAT IS THE ANSWER?

HOW TO CONVERT COLORS FAITHFULLY IN ACROBAT?

Because of my experience using profiles in Photoshop — I was pretty shocked to see this "broken" behavior with Photoshop PDF — but if my observations are correct, and I believe they are — you would be wise to BEWARE of using Photoshop PDF if you need to Convert Colors or perform any profile color conversions in Acrobat.

I packaged my original "problem" PDF by opening my ten PDI images in Photoshop and savining each one as Photoshop PDF — I opened one of those PDFs in Acrobat and dragged the other nine into its Pages Panel, Saved and uploaded it.

A PROPER WORKFLOW TO CONVERT COLORS IN ACROBAT

Again, if you want a Acrobat tutorial for a CONVERT COLORS WORKFLOW just click on the link.

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