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?
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.
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.
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.)
Re: USAF 1951 test chart in SVG format
Re: USAF 1951 test chart in SVG format
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
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
Re: USAF 1951 test chart in SVG format
Quote:
Originally Posted by
ramon
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
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)
http://213.251.184.113/largeformatph...ION_TARGET.jpg
With my scanner's (Epson V700) resolution is near 1.4.
How can I translate this number to dpi?
Thanks