nx_imgxform.nx

nx_imgxform.nx -- DETERMINISTIC IMAGE-TRANSFORMATION BATTERY: the adversary set a reverse-image engine must survive. TinEye's product claim is that it finds "modified versions" of an image -- resized, cropped, edited, colour-adjusted, watermarked. You cannot honestly say how close we are to that without APPLYING those modifications and MEASURING what survives. This organ is that adversary: 16 named transformation classes, pure integer, zero float, bit-reproducible (fixed LCG seed), each a pure function grayscale(w,h) -> grayscale(w2,h2). It deliberately holds NO ranking or hashing logic -- it only DEFORMS. nx_imgbench does the measuring, nx_phash/nx_visdesc do the describing. Single responsibility: this file's one job is "make a modified copy of an image, the way the real world modifies images". The classes are chosen from what actually happens to an image on the open web (and therefore what TinEye/Google/Yandex are judged on): CDN rescaling, thumbnail generation, re-encoding artifacts, editorial cropping, letterboxing into a fixed aspect, mirroring, EXIF-rotation, brightness/contrast "enhancement", additive sensor/compression noise, and watermark/caption bars. license_tier: ORIGINAL