imgcvt
Purpose
The Imgcvt utility converts images or a sequence of images from one image format to another.
Description
In any shell window, enter imgcvt followed by the name of the image that you want to convert. The input and output image formats are usually determined by the filename extension or image content. However, when the input or output image has no extension, or cannot be identified, the -f and -t options can be used to indicate the desired formats. You can use the following options.
imgcvt <options> input_image output_imageExample 1
imgcvt -f sgi -t tiff input_image output_imageThis line converts the image named input_image that is in the Silicon Graphics format to the TIFF format and saves the image out to a different name, output_image.
Example 2
imgcvt -f tiff -t iff input_image output_imageThis line converts a TIFF image to the IFF file format.
The following table lists the imgcvt options.
| Command line options | Description |
|---|---|
| -f input_image_extension | Identifies the specific image format that you are converting from. For example,-f sgi means that only files matching the Silicon Graphics image format are accepted as input. |
| -t output_image_extension | Identifies the specific image format that you are converting to. For example -t tiffmeans that files will be converted to the TIFF image format only. |
| -n start end step | Is the start, end and step of an input image sequence (only whole numbers are accepted). |
| -N start end step | Is the start, end and step of an output image sequence (only whole numbers are accepted). |
| -r range | In an input image sequence, selects the range of images to be converted from. For example:imgcvt -r 1-5 ...imgcvt -r 1-5x2 ...imgcvt -r 1-5,10-20x2,50 ...A sequence specifier is a list of single frames or ranges separated by a comma or a slash. In this example, they are individual, numbered files. For each range, an optional step can be specified after an x.Sequences can be reversed and offsets can be added to the input or output frame number:imgcvt -r 100-1 -R 1-100 in.#.rgb out.#.rlaimgcvt -r 1-100 in.#.rgb out.#+100.rla |
| -R range | In an output image sequence, selects the range of images to be converted to. |
| -h | Provides a brief description of each option. |
| -s | Silent mode. |
| -v | Verbose mode. |
| -V pal/ntsc | Video mode for yuv files. |
| -C compress | TIFF compression types: LZW (the default) or NONE. |
| -q N | JPEG quality (0...100; default is 75). |
| -m | Explore map format. |
When you are working on a sequence of images, the # and @ symbols refer to the current frame number:
- The hash (#) indicates a four-digit padded number,
- whereas the @ symbol indicates a non-padded number.
The following converts a sequence of 100 frames:
imgcvt -n 1 100 1 image_in.iff.@ image_out.#.rlaFor more precise control of the frame number format, use either multiple @ symbols to set a specific padding or the standard printf(3S) notation:
imgcvt -n 1 100 1 image_in.@@@.rgb image_out.#.rla imgcvt -n 1 100 1 image_in.%03d.rgb image_out.#.rla imgcvt -n 1 100 1 image_in.%.2f.rgb image_out.#.rlaUsing image filename extensions
Use the following filename extensions to convert images from one image format to another.
In the -f option, you specify the extension of the image format that you are converting from.
In the -t option, you specify the extension of the image format that you are converting to.
Image Format Extension Abekas NTSC or PAL .yuv Alias .als Explore GIF .gif JPEG .jpg Kodak Cineon .cin Lucas Film .lff Maya IFF .iff Pixibox PXB .pxb PXN PPM raw/ascii .ppm Prisms .pri Quantel .qtl SGI .rgb, .sgi or .bw Softimage .pic Targa RGB/BW .tga TIFF 6.0 .tif or .tiff Vista .vst Wavefront RLA .rla Windows bitmap .bmp