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Thread: USAF 1951 test chart in SVG format

  1. #1

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    USAF 1951 test chart in SVG format

    Where can I find a scalable vector graphic (SVG file) of USAF 1951 Resolving power target?

    Dimensions of USAF 1951 are here: http://www.efg2.com/Lab/ImageProcessing/TestTargets/

    SVG software is free (inkscape). Someone with the knowledge (not me) can made this file.

    Does anyone here knows how to make this file?

  2. #2

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    Tacoma, WA
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    Re: USAF 1951 test chart in SVG format

    You can get a PostScript version of the file from photo.net. That is a vector format- not SVG but still vector. There are many ways to convert PS to SVG, you can Google that one fairly easily.

  3. #3

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    Re: USAF 1951 test chart in SVG format

    pm your email address and I'll send you an svg conversion I made from the ps file.

  4. #4

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    Re: USAF 1951 test chart in SVG format

    Thank you both, I have found an autocad (DXF,DWG) version: http://www.vinland.com/USAF-1951.html

    Now I am searching a high resolution laser engraving service.

    (Edmund Optics asks between $120 and $1,250 for a glass target. I Want to know if I can save some cents.)

  5. #5

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    Re: USAF 1951 test chart in SVG format


  6. #6

  7. #7

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    Re: USAF 1951 test chart in SVG format

    Hello Emmanuel,

    Thanks, but I don't want to test a lens. I want to test a scanner.

    So I do not want a enlarged USAF chart, but instead a reduced chart to test the optical resolution of the scanner.

    I contacted with one laser engraving service and the told me that they have a maximum resolution of 1200 dpi (theoretical given by manufacturer of laser engraving system). This is not enough.

    I think of two options:

    1) print that pdf file and make a reduction with some macro lenses on E6 or BW film.
    2) find a printer with high resolution and print on transparency (polyester).

    Thanks

  8. #8

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    Aug 2008
    Location
    Berlin, Germany
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    Re: USAF 1951 test chart in SVG format

    Hi Ramon,

    I used the scanner target made by Ivan Danes (Danes Picta) to test my scanner. Just look under pre-press. The highest resolution pattern on that target is 250 lp/mm. The price was €67 in 2008.

    Keep in mind that testing a scanner with a high contrast target can be used as a reference for comparison but it does not necessarily reflect the results of scanning photographic film. On film the high frequency contrast is much lower than on a test target that is a lithographic contact print. For real world results it may be more interesting to see how your scanner affects your system resolution.

    -Dominique

  9. #9

    Join Date
    Jun 2008
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    Natimuk, Vic, Australia
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    Re: USAF 1951 test chart in SVG format

    Quote Originally Posted by ramon View Post
    Thank you both, I have found an autocad (DXF,DWG) version: http://www.vinland.com/USAF-1951.html

    Now I am searching a high resolution laser engraving service.

    (Edmund Optics asks between $120 and $1,250 for a glass target. I Want to know if I can save some cents.)
    Ramon
    Silverfast software sells a USAF target that is cheaper but I don't know much about it, I think its 35mm but may still be useful.

    Let us know if you find a good option as I would also like a decent scanner test chart..

    Steve
    Living beside a big rock but dreaming of mountains.
    Natimuk, Vic, Australia
    http://stevehallphoto.photoshelter.com

  10. #10

    Join Date
    Feb 2011
    Location
    Madrid
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    Re: USAF 1951 test chart in SVG format

    Good news !

    I have found a test resolution target in the last frame of a microfiche ($3 USD at the auction site)



    With my scanner's (Epson V700) resolution is near 1.4.

    How can I translate this number to dpi?

    Thanks

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