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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["c","image-io","images","single-file"],"created_at":"2024-10-27T17:40:29.496Z","updated_at":"2026-03-10T18:02:09.929Z","avatar_url":"https://github.com/mnhrdt.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"IIO\n===\n\n\n1. OVERVIEW\n-----------\n\nThis is a collection of C functions (not a library), for reading small images\nin many formats.\n\nTo use the functions, copy the \"iio.c\" and \"iio.h\" files into your source code.\nEdit the macros at the start of \"iio.c\" to fine-tune your library requirements.\n\nFind bindings for lua, octave and python inside the \"interfaces\" folder.\nThe Python binding can be installed by \"pip install iio\".\n\nFind several usage examples in the imscript suite: git.sr.ht/~coco/imscript\n\n\n\n2. PHILOSOPHY\n-------------\n\n\nAn image is an array of numbers.  Not intensities, not luminances, just\nnumbers.  The iio functions allow you to read these numbers from files.\nIf the file contains the number 7, then iio will give you 7.  All metadata\nregarding the meaning and scaling of these numbers is energically ignored.\n\nImages are always read as a whole, and are copied several times internally.\nThus IIO is only suitable for reading small images.  If you need to read small\nportions of large images in an efficient way, take a look at \"fancy_image.c\"\n\nAs a matter of principle, no image processing is ever done by iio.\n\n\n\n2. BASIC USAGE\n--------------\n\nRead the pixels of \"lena.png\" into an array of floats:\n\n\tint w, h, pd;  // image width, heigth, pixel dimension\n\tfloat *x = iio_read_image_float_vec(\"lena.png\", \u0026w, \u0026h, \u0026pd);\n\nWrite an array of WxHxD floats into file \"out.tif\":\n\n\tiio_write_image_float_vec(\"out.tif\", x, W, H, D);\n\nWhen reading an image, the filename extension is ignored.\nWhen writing an image, the extension is used to select the file format.\n\nReading from the image \"-\" is equivalent to reading from standard input.\nWriting into the image \"-\" is equivalent to writing to standard output.\n\n\n2.1. OTHER LANGUAGES\n\nThe bindings for other languages strive to be the most natural possible.\nSometimes the numbers are force converted to floats.\n\n# octave\nx = iio_read('lena.png')\niio_write('neg_lena.png', 255-x)\n\n-- luajit\nx = iio_read(\"lena.png\")  -- x has fields .w .h .pd .x\niio_write(\"lena.png\", x)\n\n-- lua\nlocal iio = require(\"imgiio\")\nx = iio.read(\"lena.png\") -- x has the same fields, and is callable as x(i,j)\niio.write(\"lena.png\", x)\n\n# python\nimport iio\nx = iio.read(\"lena.png\")          # x is a numpy array of shape (256,256,3)\niio.write(\"neg_lena.png\", 255-x)\n\n# jupyter notebooks and sixel-terminals\niio.display(x)            # display one image inline\niio.gallery([x, y, z])    # display a flip-enabled image gallery\niio.explore(x)            # advanced display of one image, allowing zoom/pan\n\n\n\n3. ADVANCED USAGE\n-----------------\n\n3.1. ALTERNATIVE PIXEL ORDERING ( RGBRGBRGB... vs. RRR...GGG...BBB... )\n\nAn image is an array of pixels, and each pixel is an array of samples.\nThis means that for a typical RGB image the numbers are stored as RGBRGBRGB...\n\nIf you want RRRRR...GGGG...BBBB... you do not want an image, but an array of\nimages, where the components of each pixel have been broken into separate\nimages.  Then you use the \"_split\" functions instead of the \"_vec\" functions\nfrom iio.\n\nRead \"lena.png\" into three contiguous images with the R,G,B components of each\npixel:\n\n\tint w, h, pd;  // image width, heigth, pixel dimension\n\tfloat *x = iio_read_image_float_split(\"lena.png\", \u0026w, \u0026h, \u0026pd);\n\n\n3.2. GRAY IMAGES\n\nIf you want to work with gray images (e.g., one-dimensional pixels), there are\nfunctions where pd=1 is implicit.  The following code reads a gray-level lena:\n\n\tint w, h;  // image width, height\n\tfloat *x = iio_read_image_float(\"lena.png\", \u0026w, \u0026h);\n\n\n3.3. OTHER DATA TYPES\n\nThe recommended data type for iio is \"float\".  However, the other C types are\npossible.  For example, the following code quantizes an image to 8 bits\n\n\t// quantize a floating-point tiff into a 8-bit png\n\tint w, h;\n\tuint8_t *x = iio_read_image_uint8(\"in.tiff\", \u0026w, \u0026h);\n\tiio_write_image_uint8(\"out.png\", x, w, h);\n\nNotice that, since IIO does not do image processing, the quantized values are\nnot scaled.  In this example, if \"in.tiff\" had floating-point values between 0\nand 1, then \"out.png\" will be identically zero.  If you want any kind of value\nscaling you have to do it yourself:\n\n\t// quantize a floating-point tiff into a 8-bit png\n\tint w, h;\n\tfloat *x = iio_read_image_float(\"in.tiff\", \u0026w, \u0026h);\n\tuint8_t *y = malloc(w*h);\n\tfor (int i = 0; i \u003c w*h; i++)\n\t\ty[i] = 255 * x[i];\n\tiio_write_image_uint8(\"out.png\", y, w, h);\n\nWhen converting floats into ints, numeric values outside the range of the int\nare clipped, and NANs are converted to 0.\n\n\n4. MAGIC USAGE\n--------------\n\n4.1. MAGIC FILENAMES\n\nSome strings are recognized by IIO as \"magic\" filenames\n\n\t\"-\"                       standard input (when reading)\n\t\"-\"                       standard output (when writing)\n\t\"zero:512x512\"            a zero gray image of the indicated size\n\t\"zero:512x512x3\"          a zero color image of the indicated size\n\t\"one:WxH\"                 an image of ones\n\t\"constant:17:256x256\"     a constant gray image = 17\n\t\"constant:nan:256x256x3\"  a rgb image full of NANs\n\t\"http://URL\"              dowload the image using wget and load it\n\n\n4.2. MAGIC ACCESSORS\n\nThe different parts of a multi-part TIFF image can be accessed by a suffix:\n\n\t\"file.tiff\"               read the first image in the file\n\t\"file.tiff,0\"             equivalent to \"file.tiff\"\n\t\"file.tiff,3\"             read the fourth image in the file\n\nSimilarly, for the different (named) datasets in an HDF5 image:\n\n\t\"file.nc\"                 read the \"/dset\" dataset (unlikely to exist)\n\t\"file.nc,/PROD/radiance\"  read the named dataset\n\n\n4.3. RAW IMAGES\n\nIdea: to read a raw file named \"file.xxx\", open the image\nwith name \"RAW[...]:file.xxx\".  The \"...\" specify the\ndetails of the raw format.\n\n\nExample:\n\n\tRAW[w320,h200,tFLOAT]:file.xxx\n\nThis reads 320x200 floats from \"file.xxx\".\n\nThe contents of [ ] are a list of \"tokens\", separated by \",\"\n\nEach token is a character followed by its value\n\nValid characters with their meaning:\n\n\tw = width\n\th = height\n\tp = pixel dimension (e.g. 1 or 3)\n\n\tt =  one of \"INT8\", \"UINT8\", \"INT16\", \"UINT16\", \"INT32\", \"UINT32\",\n\t\"INT64\", \"UINT64\", \"FLOAT\", \"DOUBLE\", \"LONGDOUBLE\", \"HALF\", \"UINT1\",\n\t\"UINT2\", \"UINT4\", \"CHAR\", \"SHORT\", \"INT\", \"LONG\", \"LONGLONG\",\n\n\to = offset bytes to be ignored from the start of the file\n\t    (if negative, ignored from the byte after th end of the file)\n\t    ((default=-1 == EOF))\n\n\tb = 0,1 wether pixel channels are contiguous or broken into planes\n\n\te = 0,1 controls the endianness.  By default, the native one\n\n\tr = xy, xY, Xy, XY, yx, Yx, yX, YX\n        controls the orientation of the coordinates (uppercase=reverse)\n\nAll the numeric fields can be read from the same file.  For example,\n\"w@44/2\" says that the width is read from position 44 of the file\nas an uint16, etc.\n\nMore magic: Specifying the RAW type using environment variables.\n\nTypically, when IIO fails to recognize the filetype, it tries some desperate\nmeasures.  One of this desperate measures is enabled by the environment\nvariable  IIO_RAW, that specifies the \"rawstring\" of the file to be opened.\n\n\n4.4. IMAGE COMMENTS\n\nAs a matter of principle, any kind of image metadata is severely frowned upon.\nStill, iio provides limited support for adding metadata to image files at the\nmoment of writing them.  Only \"comment\" metadata fields are allowed, and only\nfor four file formats: png, jpeg, tiff and ppm.\n\nMetadata comments are specified by the REM prefix when calling iio_write_*.\nFor example, writing a file with this name:\n\n\tREM[abc]:file.png\n\nWill write an image \"file.png\" with the comment \"abc\" inside.\n\nEquivalently, you can also set the environment variable IIO_REM=abc to the same\neffect.\n\n\n\n5. BLACK MAGIC USAGE\n--------------------\n\nThe suffix \"TRANS\" allows to apply some transformations to images after being\nread.  For example\n\n\tTRANS[x=10]:file.png         trim the first 10 columns of the image\n\tTRANS[y=10]:file.png         trim the first 10 lines of the image\n\tTRANS[w=100]:file.png        force the image to have width 100\n\tTRANS[h=100]:file.png        force the image to have height 100\n\tTRANS[y=10,h=100]:file.png   extract lines 10...110\n\tTRANS[h=100,y=10]:file.png   extract lines 10...90\n\tTRANS[flip=topdown]:file.png flip the image top down\n\nNotice that arguments of TRANS are comma-separated and applied sequentially.\nBesides \"topdown\", the \"flip\" transform admits the following arguments, with\nobvious meanings.\n\n\tidentity\n\tleftright\n\ttopdown\n\ttranspose\n\tposetrans\n\tr90\n\tr270\n\tr180\n\nThere is a further, very dangerous, argument of TRANS that is named \"pipe\".  It\npipes image through the indicated shell command.\n\n\tTRANS[pipe=\"qauto -i\"]:file.png\n\t\tNormalize the colors of the image\n\n\tTRANS[pipe=\"plambda 'split rot rgb'|qauto -i\"]:file.png\n\t\tSwap the blue and green channels, and normalize\n\n\tTRANS[pipe=\"plambda split_rot_rgb|qauto -i\"]:file.png\n\t\tSame as before, but easier to escape\n\nEven worse (!):  You can define an environment variable \"IIO_TRANS\" and the\ntransformation will be applied to *all* iio-using programs that see the\nenvironement variable.  For example, if you have a folder with a lot of images,\nyou can browse their fft using pvflip as follows:\n\n\tIIO_TRANS=\"pipe=fft|plambda vnorm_1_+_log\" pvflip *.png\n\nThat's enough black magic for now, but rest assured that there's more.\n\n\n\n6. COMPILE TIME CONFIGURATION\n-----------------------------\n\nThe visible interface to iio is defined on file \"iio.h\" and it does not change.\nHowever, the set of recognized image formats can be chosen at compile time,\neither by manually editing the file \"iio.c\" or by setting preprocessor\nvariables.\n\nThe simplest setting is to disable all library requirements so that iio only\ndeals with simple uncompressed formats like pgm and npy.  For that, uncomment\nthe line that defines IIO_DISABLE_IMGLIBS at the start of iio.c.  Equivalently,\nyou can pass this definition as a preprocessor option: -DIIO_DISABLE_IMGLIBS\n\n\n//#define IIO_SHOW_DEBUG_MESSAGES\n//\n// Wether you want to be extremely verbose (useful for debugging only)\n\n//#define IIO_ABORT_ON_ERROR\n//\n// Whether to ABORT the program on error instead of returning NULL.\n\n//#define IIO_DISABLE_IMGLIBS\n//\n// Disable all readers requiring external libraries.\n\nYou can also select a particular set of libraries from the compiler command\nline.  For example, the options \"-DI_CAN_HAS_LIBTIFF -DDISABLE_LIBPNG\" enables\nTIFF and disables PNG.\n\n\n\n\n\n7. SUPPORTED FORMATS FOR READING\n--------------------------------\n\nThe following image formats can be read natively, regardless of the\ncompile-time options:\n\n\t* PNM (any format recognized by netpbm)\n\t* NUMPY (python's numpy arrays)\n\t* RIM (megawave's image format)\n\t* ASC (cimg general 4d arrays)\n\t* PFM (portable floatmap)\n\t* QNM (a straightforward generalization of PNM)\n\t* CSV (a csv array is read into a gray image)\n\t* VRT (gdal's virtual images)\n\t* PCM (for optical flows and complex images)\n\t* FLO (for middlebury optical flows)\n\t* JUV (optical flows)\n\t* LUM (\"luminance\" images)\n\t* FARBFELD (suckless 16bit photo format)\n\t* PDS (Planetary Data System)\n\t* VICAR (astronomical images)\n\t* CCSD3ZF (PDS with a different magic number)\n\t* FITS (astronomical images)\n\t* raw uncompressed image data (see section 4 \"MAGIC USAGE\" above)\n\nThe following formats can be read using external library support (when the\nappropriate compile-time option is enabled):\n\n\t* PNG\n\t* JPEG\n\t* TIFF\n\t* WEBP (disabled by default, for now)\n\t* HEIF (disabled by default)\n\t* EXR (disabled by default, shenanigans on some bsd distros)\n\t* HDF5 (disabled by default, huge dependency)\n\n\n\n8. SUPPORTED FORMATS FOR WRITING\n--------------------------------\n\nAlthough the main concern of IIO is to READ images, the library\nprovides some convenience functions for writing images.  This is a\nsecondary afterthought, and there is no intention to support a\ncomplete set of formats.  Specifically, lossy compression is not\nimplemented.\n\nBy default, images are saved as (uncompressed) numpy arrays.  If a file\nextension is recognized then a different format is used:\n\n\t.npy  : Numpy array\n\t.asc  : Cimg's 4-dimensional array\n\t.mw   : Megawave's RIM files\n\t.pgm  : portable graymap\n\t.ppm  : portable pixmap\n\t.pfm  : portable floatmap\n\t.csv  : comma-separated values printed in ascii\n\t.flo  : a middlebury optical flow\n\t.uv   : javier's optical flow format\n\t.six  : sixels (useful for plotting into xterm)\n\n\t.tif  :\n\t.tiff :\n\t.TIF  :\n\t.TIFF : tiff format (type is determined by C data type)\n\t.png  :\n\t.PNG  : png format (8 bits)\n\t.jpg  :\n\t.jpeg : JPEG format (with default quality from libjpeg)\n\nTo force TIFF output format, prefix the filename with \"TIFF:\".  For example,\n\"TIFF:-\" writes a TIFF file to stdout.\n\nTo force 16 bits png, use the prefix \"PNG16:\".\n\nTo change the output jpeg quality set the environment variable IIO_JPEG_QUALITY.\n\n\n\n\n8. FILES\n--------\n\niio.h                     interface (main source of documentation)\niio.c                     implementation\n\ndoc/*                     documentation (mostly philosohpical)\nsamples/*                 test images\nmini/iio.{c,h}            mini version, crippled, without deps\ninterfaces/octave/*       octave bindings\ninterfaces/lua/*          lua bindings\ninterfaces/python/*       python bindings\ninterfaces/cmake/*        cmake helper files\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmnhrdt%2Fiio","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmnhrdt%2Fiio","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmnhrdt%2Fiio/lists"}