Add 'What about Reading PostScript Files Into Raster Images?'

What-about-Reading-PostScript-Files-Into-Raster-Images%3F.md

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+<br>Additionally, you may write PostScript recordsdata in a wide range of codecs, both stage 1 (uncompressed) and level 2 (using DCT (aka JPEG) and CCITT-G4 compression with the choice to paint via the binary mask. That is implemented in psio.c, the place you will find a lot of functions that support these two compressed codecs, in addition to because the ascii85 error-correction encoder that encodes four bytes of binary data into 5 bytes of ascii. See prog/psiotest.c for examples. What about studying PostScript information into raster pictures? Fortunately, we've got Aladdin's ghostscript to do that. I've put several bash scripts in prog, akin to ps2png, that use ghostscript with varied output units convert a PostScript file to a set of compressed image recordsdata, one file per web page. PDF recordsdata are also easily generated from PostScript utilizing Aladdin's ps2pdf, which is a shell script that also runs ghostscript with the appropriate output gadget.<br>
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+<br>Affine transforms are linear transformations that generate coordinates in the dest picture (x', y') from those in the supply (x, y). Three corresponding factors in the supply and dest are enough to specify the affine remodel utterly. There are thus 3 linear equations, with 6 coefficients. 6 coefficients is equivalent to an occasion of this set. It is definitely a surprising quantity of labor to implement all these transforms efficiently on photographs of various pixel depths, including RGB, and we have now tutorial pages for every of those transforms. Translation is a special case of rasterops, which is described intimately because of its common significance in picture composition and evaluation. Rotation will be implemented by three shears, and, for small angles, approximated by two shears. Shear is efficiently applied with rasterops, as a set of translations. Scaling here may be anisotropic, with completely different scaling elements in orthogonal instructions. Rasterops is the one most helpful image processing function. It performs an arbitrary logical operation between two rectangles of supply and dest pictures, storing the outcome in the dest image. See the rasterops page to grasp how it's used for many alternative functions, corresponding to image composition, show, translation, binary morphology, etc. It really works on pictures of arbitrary depth, and does the minimal clipping required to remain throughout the allotted rasters. The excessive-level interface to rasterops is implemented in rop.c. The overall operate pixRasterop() takes 9 arguments: 5 for the dest picture and rectangle, three for the supply picture and rectangle corner for use, and 1 to specify the actual operation. Simple translation could be done either between a supply and dest image using the overall function, or in-place using pixRastreopIP().<br>
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