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bmp file for viewing (both pre-AA-filter and post-AA-filter versions), and numerical output is available to show how the camera's sensor responds to the image, or as a "dump" of the image centerline values. The simulation tool, Vcam.exe, starts with one of several basic object patterns, then applies defocus, diffraction, lens point-spread and/or AA filtering as specified by the user. For example: What does diffraction look like? How does the AA (anti-aliasing) filter affect an image? Should I select a camera with or without an AA filter? Can diffraction substitute for the function of an AA filter? How does lens quality, focus precision and lens aperture affect the resolution my camera can achieve? When will moire' (aliasing) show up? How do optical imperfections combine to limit resolution? How do different test-objects compare for evaluating lenses and cameras? When is my lens diffraction-limited? How strong is my camera's AA filter?
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The Optical Simulation tool presented here is designed to answer questions related to resolution, diffraction, AA filter effects, lens quality, and how our cameras "see" the smallest details. The purpose of the image patch is to allow the user to evaluate end-to-end performance of the entire photographic process from test subject to converter output, assess raw-converter performance, and test the effects of converter settings on the quality of the converter's image rendering. The image patch consists of the sensel values normally output by the /L switch, shifted across all offsets to create vertical lines with a slight slant (40:1). By default, the output image patch is approximately 400x100 pixels for pre-AA or post-AA output only, or 400x200 pixels when both output options are enabled. NEF format must be 14-bit uncompressed a template version is included in the archive. Supports all Conv2 features and switches new switches /X and /Y are added. NEF file of that name is present and the test object is a periodic signal that spans the full workspace. 1.24, this application adds image output to file Output.NEF, when a. 1.00: A Virtual Camera, based on Conv2 ver. The earlier simulation application, Conv2, is no longer supported since Vcam includes all of its features. It is no longer necessary to use the /L switch to enable the analysis parameter output, or the image patch output to Output.NEF.įor reasons of size, the template raw file has been placed into a separate archive. Switch /Q is added, to alter the spectral distribution of light assumed for generating the diffraction contour.
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As a convenience, frequently-used switches may be placed into file Vcam_sw.txt, which is scanned before the command-line switches are parsed the command line switches have priority. 1.50: Adds switches /Z, /N, /G, /E and /J to provide more options for the raw-file image patch output. ActionPhotos by Marianne: Technical Information
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