Dark Image Previews

[MIke Randolph]

I am having a persistent issue regarding dark image previews. Any image from a Nikon D4, even if the exposure is spot-on, will result in a preview in Resource Space appearing 2 stops darker than the original NEF file. Images shot with a Canon 5d mkII, Nikon d700 and d3 will generate previews that look perfect. We have 4 D4 bodies in the office, and the problem in consistent with all d4 cameras. The JPG's generated by Resource Space from the RAW file shows the same issue. 

Uploading a JPG file either shot by the D4, or converted from an NEF file with Photoshop, Lightroom or PhotoMechanic will show up fine in Resource Space.

Some of the solutions we have tried:

Different Camera Settings

Raw Lossless compression

Raw Uncompressed

sRGB color profile

Adobe RGB color profile

I have tried a couple solutions suggested by other threads. One of them involved updating ImageMagic, which we did. The other is outlined below.

A potential fix ... it refers to the image magic module df resource space:

 

File: include\image_processing.php

Line: 886

Changed “RGB” to “sRGB”

 

File: include\preview_preprocessing.php

Line: 595

Old:

$profile="+profile icc -colorspace RGB"; # By default, strip the colour profiles ('+' is remove the profile, confusingly)

New:

$profile="-profile icc -colorspace sRGB"; # By default, strip the colour profiles ('+' is remove the profile, confusingly)

 

Line: 633

Changed “RGB” to “sRGB”

Any suggestion would be GREATLY appreciated. I'm not ready to give up just yet. 

Thanks,

Michael Randolph

[Jeff Nova]

Have you tried ExifTool extraction? It's a config option. Search for NEF. 

Also if you are using dcraw as delegate to ImageMagick, report the issue in their forums and see if it's a camera-specific bug. 

Jeff

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Jeff Nova

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Colorhythm LLC

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Fax: +1 415-399-9928

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[resourc...@gmail.com]

I have the same problem most likely. Using a cannon camera and with the file format cr2. The camera generates cr2 and jpg files. The jpg files upload fine, but the cr2 files are all super dark. Then any resulting image made from the dark image is also dark.

Is there a fix for this issue? I read some threads about colourspaces and accurate colour representation but its way over my head. I am just an IT guy trying to implement a DAM. The implementation will fail if resource space keeps fowling the files. They look fine in explorer and any image program I care to try. The problem begins when these raw files are uploaded to the dam. Below is a screen shot of what i mean. The RAW is on the right and the jpg is on the left. Generated with a canon 6 eds or something like that.

[Allison M Stec]

Are you attempting to extract a cr2 embedded preview at all ("$cr2_thumb_extract=true;")? This feature is off by default.

I know I have to build a version of ImageMagick from source to get a current version, so that's another possible place to look.

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[resourc...@gmail.com]

Firstly, I have tried to enable this variable (("$cr2_thumb_extract=true;") in /include/config.default.php) but this results in no image preview whatsoever and an error regarding html5. (sorry about image placement it seems that google forums wants to put images at the beginning of every message sigh)

Secondly I see there is another thread about this, so i should make the comment that imagemagick version is: Version: ImageMagick 6.9.3-6 Q16 x64 2016-02-28 http://www.imagemagick.org

which i think is pretty current!. I dont have any compiler so i cant compile anything (windows). I just built the resource space server this week, so every library should be pretty current. this is from the installation check screen (which is quite useful! and should be mentioned in the install docs). I noticed that php_exif.dll was not enabled from this screen so i enabled that as well but it did nothing.

[Jeff Nova]

Be sure you edit config and not config_default for all your manual settings.

Do you have Exiftool installed and its path set?  That's what extracts the previews from CR2s when that is set, not ImageMagick. 

Best,

Jeff

[resourc...@gmail.com]

whats the full path to this config file? I just searched /resourcespace/* for the string in any *.php files. Thats how i am figuring out where to make these changes, as people say "config file" but then never post a path to it.


Oh i see it now, its in /resourcespace/include/config.php and i didnt find it because those strings aren't actually in the file, i guess i have to add them taking the syntax from default.config.... Not what i am used to but whatever.
I wonder why changing the default.config.php files had an effect on the system though.

Actually its the same effect. I get the same HTML 5 error when i added it to /include/config.php.

i tried adding "$imagemagick_colorspace="sRGB";" to the config file (correct one this time) and it has not helped either.

Exiftool is installed. see screen shot.

I tried to attach the cr2 file but its too big (20mb) and the limit is 10mb...
here i put it on wetransfer:

http://we.tl/u6Qfnezh1U

[Allison M Stec]

RS was able to extract a preview image with $cr2_thumb_extract=true and didn't suffer from the darkness that the ImageMagick created previews had. Preview generation was also much faster this way.

Unfortunately, I wasn't able to get a good preview any other way, Attempts to use icc extraction or ImageMagick color profile preservation options resulted in darkened previews.

I'm no expert when it comes to image color, but maybe someone else can explain these results.

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[resourc...@gmail.com]

Wow great. I am glad it can theoretically work but i think my server must be misconfigured because all i get when uploading after setting that variable to true is:

Upload summary - server time : 04 Mar 16 @ 18:20
IMG_101212.CR2 - Server side error! Please contact the administrator!

And the preview is not generated. I turned on the debug log but there is no error in it. Just a bunch of sql and nothing says failed or anything like that.
Any other place i can look translating "server side error" into an error i can use? exiftool version is 10.11

[Allison M Stec]

I'd have a look at the php error log.

You could also modify the error output around line 719 of upload_plupload.php to include the actual error and not just a generic response.

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[resourc...@gmail.com]

I think the code you are talking about is from line 657 to line 680, however i dont see anything i can comment in to make errors log better. There is no commented out code there, so how exactly would i "modify the error output"? Not sure what you mean by that. I am not a developer, i am a systems administrator. I obviously cant write php code...

line 668 is the string 'Server side error! Please contact the administrator!' so i assume i am supposed to put some variable with the error. i asked my co worker who develops PHp and he suggested changing line 668 to read "  uploaderrormessage = uploadError;" but that has resulted in no errors at all and still no thumbnail generation.

please advise, more specifically if you can.

[Allison M Stec]

Try changing your line 668 from:

uploaderrormessage = 'Server side error! Please contact the administrator!';

to...

uploaderrormessage = 'Server side error! Please contact the administrator!' .$e->getMessage();

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