ALE Devices

Device specification is optional. Specifying a device allows automatic determination of point-spread functions, refinement of the correspondence between incident light and pixel values (e.g. power law), and refinement of certainty calculation.

--device <d>      Set the capture device to <d>.

Available devices are as follows:

canon_300d_raw_linear	Canon 300D (Digital Rebel) raw, linear data. [0.7.2 and later]
canon_300d_raw_linear+50mm_1.4	Canon 300D with EF 50mm f/1.4 lens, unspecified aperture.
canon_300d_raw_linear+50mm_1.4@1.4	Canon 300D with EF 50mm f/1.4 lens, aperture 1.4.
canon_300d_raw_linear+50mm_1.8	Canon 300D with EF 50mm f/1.8 lens, unspecified aperture.
canon_300d_raw_linear+85mm_1.8	Canon 300D with EF 85mm f/1.8 lens, unspecified aperture.
ov7620_raw_linear	OmniView OV7620 in raw RGB, linear mode. [0.7.0-patch1 and later]
xvp610_640x480	IBM PC Camera Pro (XVP610) in 640x480 mode.
xvp610_320x240	IBM PC Camera Pro (XVP610) in 320x240 mode.

These device options are described in more detail below.

Canon 300D (Digital Rebel) [0.7.2 and later]

Direct support for CRW files depends on the ImageMagick configuration, and may not be available on all platforms. Dave Coffin's dcraw program, invoked with arguments -d -4, will produce a raw, linear PPM file suitable for use with this device configuration. JPEG files produced by the 300D cannot be directly used as inputs for this configuration, since they are gamma-corrected rather than linear.

OV7620 [0.7.0-patch1 and later]

Standard OV7620 drivers may not include options for setting raw RGB or linear modes. Linux users may apply a driver patch to access these modes. Setting the module option rgb_raw=2 places the camera into the desired mode.

XVP610

Users of XVP610 cameras and Linux may wish to apply a driver patch. This version of ALE expects that this patch has been applied.

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