gpiv_img2gpiv(1) Converts images into raw data (extension .r) format with the


gpiv_img2gpiv [-x | --cross] [-c | --cols ncolumns] [--combine] [-h | --help] [-hdf] [--suf_a EXT] [--suf_b EXT] [--suf_num N] [-i | --inverse] [-n] [-p] [-r | --rows nrows] [-t] [-v | --version] file_base_name


gpiv_img2gpiv converts images from a common image format (gif, tif etc) into a raw data image with extension .r. Additionally, it generates an ASCII header file (extension .h). This header contains information concerning image dimensions, color depth, single or double image (for auto or cross-correlation), time and spatial scales, position of pixel# (0, 0) in the experiment and some additional (non-required) parameters.

gpiv_img2gpiv may also convert to hdf formatted images, with extension .hdf, that might be used by gpiv.

This program does not use the parameter resources from libgpiv. The default settings may be overruled by the command line options, as explained below.


-c | --cols ncolumns
The number of columns of the image (default 1280).

If the images have been obtained separately, but will have to be used for cross-correlation, they will be combined to a single image file for interrogating with gpiv_rr (or gpiv). See also --suf_a/b and --suf_num.

-h | --help
On-line help.

Converts to (or from) hdf formatted data (extension .hdf

-i | --inverse
Inverse conversion; from raw 8-bit data to image format.

--suf_a EXT
In combination with --combine: the file_base_name of the first frame to be combined is extended with suffix EXT (default: _a).

--suf_b EXT
In combination with --combine: the file_base_name of the second frame to be combined is extended with suffix EXT (default: _b).

--suf_num N
In combination with --combine: If images are numbered instead of with --suf_a and --suf_b. N represents the first of the two numbered frames which will be combined with frame N + 1. The combined image will be named to file_base_nameN.r. So, only odd or even numbered images will result to be loaded in gpiv_rr (or gpiv) for cross-correlation.

No execute, only print processes.

Prints process to stdout.

-r | --rows
nrows The number of rows in the frame of a SINGLE image (default 1024). An image frame containing a PIV pair of images (to be used for cross-correlation) should have the double amount of rows; from row #0 to row #nrows - 1 contains the first image and from row #nrows to row #2xnrows - 1 contains the second image.

Image type or format (default bmp).

-v | --version
Print version information on standard output, then exit successfully.

-x | --cross
Double image for cross-correlation (default: single image for auto-correlation).


The program uses convert.


Gerber Van der Graaf