If you are converting lots of files of different sizes and dislike the hard-coded 614400, and are using bash, you can get ImageMagick to tell you the size (height * width * 2 bytes/pixel) and use that like this: bytes=$(identify -format "%" image.png)Ĭonvert image.png -depth 16 pgm:- | tail -c $bytes > file. Then you can combine frames using webpmux. For this task you can use ImageMagick (more options here be sure to disable lossy compression unless you want it): convert frame001.png -define webp:losslesstrue frame001.webp. You can the strip the header like this: convert image.png -depth 16 pgm:- | tail -c 614400 > file.raw If your individual frames are in another format, you’ll first need to convert them to WebP. The ImageMagick command-line tools exit with a status of 0 if the command line arguments have a proper syntax and no problems are encountered. In your case, the MAX VALUE is 65535 rather than 255 because your data are 16-bit. Use the magick program to convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. The PGM format is detailed here, but suffice to say that there is header with a P followed by a digit describing the actual subtype, then a width and height and then a MAX VALUE that describes the range of the pixel intensities. This makes 8-bit grayscale with highest PNG compression. Try writing a PGM (Portable Greymap) like this. In essence, Id like complete color palette to remain exactly the same while converting TGA -> PNG -> TGA. Setting grayscale with -set colorspace Gray wont reduce the PNGs file-size unless these options are also used: -define png:compression-level9 -define png:format8 -define png:color-type0 -define png:bit-depth8. It can be used to create, edit, compose, or convert bitmap images, and supports a wide range of file formats, including JPEG, PNG, GIF, TIFF, and PDF. If you write an RGB raw file, you will get 3 channels - R, G and B. ImageMagick is a free, open-source software suite, used for editing and manipulating digital images. This is cleaner than my original answer - though should give identical results. pdfjam offers other options, which may fit your needs. For those who use this in css, add -A flag to output in one line. Once you have the image in that format, you can then proceed to process it with ImageMagick like this: convert inline:image.b64 result.png. pdfjam -paper a4paper -outfile myoutA4.pdf myout.pdf. or like this in Windows: echo data:image/png base64, > image.b64 openssl enc -base64 -in image.png > image.b64. but use pdfjam instead of ImageMagick to adjust the page size. Which will read the Red channel ( -map r), which is the same as the Green and Blue channels if your image is greyscale, and write it out as unsigned 16-bit shorts ( -storage-type short) to the output file image.raw. You can convert to pdf using ImageMagick. In effect, you can use this command stream -map r -storage-type short image.png image.raw Installation Install the imagemagick package. It can read and write over 200 image file formats. This is the metadata I get using gdalinfo: Driver: GIF/Graphics Interchange Format (.It occurred to me since answering you, that there is a simpler method of doing what you want, that takes advantage of ImageMagick's little-used stream tool, to stream raw pixel data around. ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files. However, I get a very optimised version that seems to be paletissed and just one channel. I have tried this: convert -type TrueColorAlpha Image.gif Image.png Not only that I needed to save the image using the PNG image format which is one of the small number of image formats that properly understands and handles. I would like to get a regular PNG image with the expected four channels. ImageMagick (legacy) ImageMagick ® is a free, open-source software suite, used for editing and manipulating digital images. Use the convert program to convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much. In a nutshell, I have a GIF image that I convert to PNG for further processing (with Python rasterio). The difference is that the solution proposed there does not seem to work when you want a PNG as output.
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