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Jon

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Jon last won the day on December 22 2015

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  1. Jon

    Multi-View RTI?

    This sounds like just what we need for an aircraft control column, still in the cockpit, with a badly corroded (aluminum) data plate on it. However from the practical standpoint, I assume one would move the spheres for each "view"? I'm thinking that the area is tight enough (somewhere around 2' cockpit width) we can use a powerful LED flashlight as the light source, which will give us the control we need; I'm just not sure about the sphere placement. Again, given that we have a very confined space we're working in, has anyone tried RTI of an extremely 3-D object from a fixed position (the control column is perhaps 5 cm diameter, and even with the camera mounted in the pilot's seat, it'll be under 2' away from the data plate)? We may not have enough room to move the camera around in the cockpit.
  2. Jon

    jpeg v. jpeg

    Old topic, but I think OP overlooked at least one point - JPEG compression works on the basis of blocks of pixels, not individual pixels, consequently a high-contrast subject can give misleading results, especially when the target patterns closely align with the sensor resolution. To see the effect of different compressions, and different sensor resolutions, try shooting a subject with low-contrast patterns, say a wave form varying rhythmically from white to black, possibly through several colours on the way. That's also probably a more appropriate test for RTI shooting than standard resolution charts anyhow, since we're trying to bring out minute differences in the surface of the subject. If we had nice contrasty subjects, we wouldn't need RTI.
  3. Jon

    Opening a project level folder

    Does your parent folder name have any spaces in its name? It should also use the English "jpeg-exports", not the Spanish equivalent. Bing Translate: ¿Tiene su nombre de la carpeta padre ningún espacio en su nombre? También debe utilizar el "jpeg-exports inglés", no el equivalente en español.
  4. Jon

    Embedded RTI/PTM Viewer for the web

    Check this thread.
  5. Jon

    Availability of Online Viewers?

    Gianpaolo Palma has developed a minimal web-based viewer that allows you to move the light source, but doesn't support changing rendering modes. It was mentioned here back in 2013; I've used it on a couple of in-house projects and it works very smoothly.
  6. Jon

    Double lines on document

    I've used Photoshop's Auto-align to deal with subject/camera motion between shots. Basically, import all the photos as layers (from Bridge - Tools | Photoshop | Load Files into Photoshop Layers), then align them (Layer | Align), crop as needed to trim the edges and export the layers as JPEG files (File | Scripts | Export Layers to Files).and use the output files for your RTI processing.
  7. Jon

    Lens movement

    Are you using Mirror Lockup? If you aren't, enable it. Some cameras have a "Quiet" shutter setting, which delays mirror return; this may also help reduce vibration if that's what is causing the lens to shift. For the issue of the lens extending, get some strong rubber bands; one or two of them at the edges of the focusing ring, overlapping onto the lens barrel, will keep the lens from shifting. I use Staples #84 (3-1/2" x 1/2"); other people have used one or another of the elastic "theme" bracelets often sold for fund-raising, should you have one of those around. The rubber bands are much cheaper if you don't already have one of the bracelets.
  8. Jon

    RTI Viewer [error occured]

    The RTIWebViewer, run locally on Windows, works best with FireFox; Internet Explorer, Edge, and Google Chrome have default security settings that prevent loading local executable content (thanks to the developer, Gianpaolo Palma, for prompt assistance with this).
  9. Jon

    Flash recommendation

    The EOS T3i is a DSLR, and doesn't support CHDK, but then it, like the PowerShot G16, both shoot RAW out of the box. You might consider, for RTI, using a manual-only flash like the Vivitar 385HV which is under $100 and very close to the output of Canon's Speedlite 600RT. You'd need either a long sync cord or a remote trigger to go with it though.
  10. Jon

    RTI Viewer [error occured]

    Could you tell us a bit about your computer? Memory, processor, operating system? RTI file size (for both the successful and unsuccessful files)? Can you still open the earlier file (the one that you were able to create and open a month ago)?
  11. Late to the party, but - we make aligning the images in Photoshop part of our standard processing. The procedure we use is as follows (Photoshop CS6): In Bridge select all the images In Bridge, open the image files in Camera Raw and apply any bulk processing needed (don't crop) Export them to Photoshop (Tools | Photoshop| Load files into Photoshop layers) In Photoshop select all layers In Photoshop Edit | Auto-Align Layers Crop the resulting image (so edges will align when exporting) Export the processed layers as JPEGs (File | Scripts | Export Layers To Files...), quality 12 This lets us deal with even the least stable supports as long as the essentials are in all the images (complete subject with a reasonable margin for the auto-align process, and the targets).
  12. Jon

    Yosemite OS and shooting tethered

    We tether our Canons (5D2, 5D3 and 6D) and Nikons (D300s, D90) to our Android tablets using DSLR Controller (Canon-only) or QDslrDashboard (Canon, Nikon and some others). qDslrDashboard also has Mac and Windows client software; both work over USB cables or wirelessly (natively with the 6D; via software mods to the inexpensive TPLink MR3040 routers for the other cameras). They're the inexpensive equivalents of the commercial [http://www.camranger.com]CamRanger[/url]. Zoltan (developer of qDslrDashboard) has tested his current version on MacOS 10.8, 10.9 and 10.10.
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