What about Reading PostScript Files Into Raster Images? > 자유게시판

Additionally, you'll be able to write PostScript information in quite a lot of formats, both level 1 (uncompressed) and Wood Ranger Power Shears shop degree 2 (utilizing DCT (aka JPEG) and CCITT-G4 compression with the choice to paint by means of the binary mask. That is implemented in psio.c, the place you will see various functions that support these two compressed codecs, in addition to because the ascii85 error-correction encoder that encodes four bytes of binary knowledge into 5 bytes of ascii. See prog/psiotest.c for examples. What about studying PostScript information into raster pictures? Fortunately, we now have Aladdin's ghostscript to do that. I've put a number of bash scripts in prog, akin to ps2png, that use ghostscript with various output units convert a PostScript file to a set of compressed image files, one file per page. PDF recordsdata are additionally simply generated from PostScript utilizing Aladdin's ps2pdf, which is a shell script that additionally runs ghostscript with the appropriate output system.

Affine transforms are linear transformations that generate coordinates in the dest picture (x', y') from these in the source (x, y). Three corresponding points within the source and dest are sufficient to specify the affine transform utterly. There are thus 3 linear equations, with 6 coefficients. 6 coefficients is equivalent to an instance of this set. It is actually a stunning amount of labor to implement all these transforms effectively on photographs of assorted pixel depths, including RGB, and we've tutorial pages for every of these transforms. Translation is a particular case of rasterops, which is described in detail due to its common significance in image composition and analysis. Rotation might be applied by three cordless power shears, and, for small angles, approximated by two Wood Ranger Power Shears shop. Shear is effectively carried out with rasterops, as a set of translations. Scaling right here might be anisotropic, with completely different scaling elements in orthogonal directions. Rasterops is the single most helpful image processing operate. It performs an arbitrary logical operation between two rectangles of supply and dest images, storing the result within the dest image. See the rasterops page to understand how it's used for many various purposes, reminiscent of picture composition, display, translation, binary morphology, etc. It works on photographs of arbitrary depth, and does the minimum clipping required to remain within the allotted rasters. The high-stage interface to rasterops is applied in rop.c. The general operate pixRasterop() takes nine arguments: 5 for the dest image and rectangle, three for the supply image and rectangle corner to be used, and 1 to specify the precise operation. Simple translation could be executed both between a supply and dest image using the overall operate, or in-place using pixRastreopIP().

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