Color Reader Script This script is simply another utility tool related to color topics. It will read the color values from a path selection in a Photoshop document. The image can be in Lab or RGB mode and 8-bit or 16-bit encoding. I wanted to find an alternative to the JavaScript histogram techniques. The reason is that the histogram is rather inaccurate for images in 16-bit mode. The histogram is limited to 256 integer levels. This will save the current document as a Photoshop RAW image. Note that in 16-bit mode Adobe saves the values in true 16-bit format instead of its quasi 15-bit format. The basic operation is to open a document in Photoshop, make a rectangle selection of the area to be sampled, save it as a pen path, then run the script. The image may also contain adjustment layers if desired. Download ColorReaderRaw.jsx V1.2 in a ZIP file here: ColorReader.zip I have validated the numbers extensively with sample images in all supported modes. That Legal Stuff
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Le diagramme CIE XYZ La construction du diagramme CIE-xy est une aventure passionnante pour les ingénieurs de l'époque, car il a fallu crée de toute pièce certains concepts théoriques encore inexistants. Les commanditaires de la CIE (l'industrie des couleurs et de la vision) avaient une seule exigence : un diagramme de chromaticité sans valeur négative pour les couleurs, en d'autres termes, un modèle colorimétrique où l'ensemble des couleurs se trouve à l'intérieur du triangle de référence. Exigence peu contraignante en apparence, car calculer le passage du diagramme issu du RVB vers le futur diagramme CIE-xy est du niveau de l'école primaire, car il suffit d'appliquer une transformation linéaire sous forme de matrice 3 X 3 pour donner une valeur aux trois nouvelles primaires. Mais les ingénieurs impliqués dans ce projet s'imposèrent deux autres contraintes fondamentales qui compliquèrent énormément le projet. Fig. 1. Voir en détail la construction des primaires XYZ. Fig. 2.