Why would Adobe's Lens Profile Creator distribute the checkboards as JPG files?

Generall, JPG files are a bad idea for images that contain a small number of colors (poor compression) and sharp edges (ringing artifacts).  So why then would Adobe distribute the checkboards for Lens Profile Creator as JPG, rather than some more appropriate format such as PNG?
Chuck

The jpgs are samples of what one might get when one took pictures of the checkerboards.  The actual checkerboards are indeed PDFs.  It will be interesting to disect the PDFs to see what the graphics are.  The really right thing would be vector.
Chuck 

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    function(){return A.apply(null,[this].concat($A(arguments)))}
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  • Adobe Lens Profile Creator - ERROR (Detect corners failed because file reading errors ocurred)

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  • Adobe Lens profile Creator

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  • New releases: Adobe Lens Profile Creator v1.0.4 and Adobe Lens Profile Downloader v 1.0.1

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  • Adobe Lens Profile Creator Crashes with DNG files

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    Additional Information 4:          0a9e372d3b4ad19135b953a78882e789
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  • Adobe Lens Profile Creator v 1.0.4- Does Not Work on a Mac

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  • Adding a Lens Profile to lightroom from Adobe lens profile creator

    Hi, I just made a lens profile from the lens profile creator for my Canon 80-200 2.8L. I then added the profile to the 1.0 folder that holds all the other lens profiles. However, lightroom does not list to profile as an option in the lens profiles. Is there something else that I need to do?

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  • 'Adobe Lens Profile Creator, SONY-SRF-Files in DNG konvertieren leider nicht möglich'

    Hallo
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    Damit ich ganz sicher diese Aussage machen kann, habe ich ein Probeset mit meiner Nikon-D90 fotografiert und die Raw-Files der Nikon im Adobe DNG-Konverter in DNG´s konveriert. Danach war es möglich ein neues Objektivprofil im Adobe Lens Profil Creator zu erstellen.
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    Vielleicht hat ja jemand noch eine Idee dazu, wie man die SONY-RAW-Files von älteren Cybershots doch noch in brauchbare DNG´s konvertieren kann.
    Würde mich wirklich über Angregungen freuen.
    Gruß Stefan

  • Adobe Lens Profile Creator not appending

    I am using Adobe Lens Profile Creator v1.04 to make a lens correction file.
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    Running on Windows 7 - 64bit

    Moving the discussion to Adobe Lens Profile Forum.
    Regards,
    Anit Kumar

  • DXO Labs Slams Adobe Lens Profile Creator

    Pubicly.  Check it out here;
    Click here

    See: DXO Labs Slams Adobes Lens Corrections
    This is what I responded the first and second response...
    "says Cyrille de La Chesnais, Sales and Marketing Director - Photography at DxO Labs" Uh, ok...so I'm sure HE has an advanced degree IN MARKETING maybe...
    The moment that a marketing guy starts talking smack is just about the time to quit listening...
    I'm sure that DxO is SEETHING at the prospect that a bunch of users can go out and create profiles of their lenses for free...what does DxO cost?
    It should also be noted that DxO is partially subsidized by the French military establishment (as far as I can recall).
    Just as soon as Cyrille bothers to go out and actually USE Adobe Lens Profile Creator and can PROVE using acceptable scientific testing that there's an issue, I suggest Cyrille keeps his gums together...
    Then...
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    The lens profile I made for a Canon EF50mm F/1.2 lens is very good. I uploaded the profile I made to the Adobe Lens Profile server to share with the community (which suspect is the one thing that really galls DxO the most).
    Really, let's hear from DxO's scientists not DxO's marketing guys...and let's hear from somebody who has DONE a profile using Adobe Lens Profile Creator and found severe limitations...
    Oh, BTW, the guy mentions keeping the lens profile calibration target really, really flat (to profile the geometric distortion) as though that's some kind of super difficult task. Uh, no, I don't think so...Adobe suggests having the printed targets mounted on foam core and then put the mounted targets in a picture frame to keep it flat. I used a different method of mounting the targets to the front of 1/4 plate glass placed on an easel. That way I could mount multiple sized printed targets up to 36' x 48' in size.
    I don't want to underestimate the amount of work involved in creating quality lens profiles. I shot a series of 5 F/stops with 3 focus distances using three different targets. Took about 5-6 hours (the first time) and that's in a studio space that's 26' x 53' with 12' ceilings with professional quality studio strobes and a photographer (me) who has 1/2 a clue what they are doing...I'm sure there will be a range in the quality of profiles for the lenses profiled by the "community". But here's the thing...that's to do lens profiles that can be automatically applied to masses of shots at once via presets or Camera Raw Defaults...but you can STILL go in and fine-tube the results from those profiles and use manual controls not only for distortion, CA and vignetting but also lens perspective correction...not sure you can even do that in DxO.
    No, I'm sure DxO is trying to come up with some sort of attack/defense for their product's existence...at the moment, I suspect it sucks to be them, ya know?

  • Are mid-zoom distortions interpolated in Adobe Lens Profile Creator

    Hi!
    I'm making LCP files for my two cameras. I use CHDK in my Canon PowerShots for having DNG files. I wonder, if I'm going to use three imaging sets for each camera with different zooms, let us say no-zoom, 1/2maximum, and maximum zoom, does the Lens Profile Creator calculate distortion parameters for the other zoom values as well by interpolating? I think it should do that, but I want to get a confirmation for this before adjusting thousands of photos. I have had hard times by fighting with computers lately, and I can almost sense the "oh-you-did-not-shoot-with-exact-zoom" waiting for me just behind the corner
    Best Wishes
    Immu

    Hi!
    I'm making LCP files for my two cameras. I use CHDK in my Canon PowerShots for having DNG files. I wonder, if I'm going to use three imaging sets for each camera with different zooms, let us say no-zoom, 1/2maximum, and maximum zoom, does the Lens Profile Creator calculate distortion parameters for the other zoom values as well by interpolating? I think it should do that, but I want to get a confirmation for this before adjusting thousands of photos. I have had hard times by fighting with computers lately, and I can almost sense the "oh-you-did-not-shoot-with-exact-zoom" waiting for me just behind the corner
    Best Wishes
    Immu

  • Lens Profile Creator and Astronomical Telescopes

    I'm interested in using the Lens Profile Creator with astronomical telescopes for astrophotography. Using the checkerboard to create a profile would be problematic because you can't come to focus on close objects and really need to be focused at infinity (many miles) for the optics to have the same characteristics used in astrophotography. But one can image other "dense" but not geometrically regular targets. Dense starfields in the Milky Way for example. So there may be a workaround.
    Is this an appropriate place to discuss this use?
    If not, point me elsewhere. I have heard that some at Adobe are working on astrophotography uses for Photoshop and this particular app (or something like it) would be very useful to us.
    Drew S.

    There are a number of things darks/flats/bias can't remove: curvature, coma, pincushion, chromatic aberration. Some of those (pincushion i.e. showing stars on the chip in a slightly different position from their true position) may or may not be correctable with this sort of an app. It's possible using outside data (comparing the star locations in the image to their true locations in a catalog - that's a common astrophotography measurement and only takes seconds). Correcting curvature (differing focus off axis) chromatic aberration and coma (distorted star shape off axis) seem just what this app is about.
    Printing a checkerboard on a nearby hill top sounds involved. Maybe I could get them to plough it in a regular pattern? :-)
    The camera does not capture the data you mention. The images are usually in FITS format which has an enormous amount of data about the focal length, exposure time, amount of atmosphere through which you are looking, etc.
    Calculating from the book value for the lens(es) camera chip etc would likely not be give a better result than the value obtained before correction. In some designs of scopes, particularly the most common ones, the focal length changes as you focus for example. The lenses and mirrors, comparing one scope to the next, are not perfectly identical.
    But a dense star field would be something against which you could measure changes in star shape, focus, chromatic aberration and possibly even position. Once you figured out the parameters for your particular scope+corrector lenses+camera setup you could then use that profile thereafter.
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