Spazio colore Adobe RGB

Lo spazio colore Adobe RGB è uno spazio colore RGB sviluppato dalla Adobe Systems nel 1998. È stato progettato per comprendere molti dei colori ottenibili con le stampatrici a colori CMYK, ma attraverso l'utilizzo dei colori primari RGB su una periferica quale lo schermo di un computer. Lo spazio colore Adobe RGB contiene approssimativamente il 50% dei colori visibili specificati attraverso lo spazio colore LAB, con un aumento di gamma rispetto allo spazio colore sRGB principalmente sul ciano e verde.

Caratteristiche

Nello spazio colore Adobe RGB i colori sono indicati con i tre valori $(R,G,B)$ , dove ognuno dei componenti R, G e B può assumere valori tra 0 e 1. Quando visualizzate su un monitor, vengono specificate le esatte cromaticità del punto bianco $(1,1,1)$ , punto nero $(0,0,0)$ e le primarie [ $(1,0,0)$ etc.]. Oltre a questo, la luminanza del monitor dovrebbe essere di 160 cd/m² sul punto bianco, e 0,5557 cd/m² sul punto nero, che implica un tasso di contrasto di 287,9. L'ambiente del monitor si considera illuminato a 32 lx.

Come per lo spazio colore sRGB, nello spazio colore Adobe RGB i valori delle tre componenti RGB non sono proporzionali alla luminanza. Piuttosto, si assume un valore della correzione gamma pari a 2,2, senza il segmento lineare vicino allo zero che è presente in sRGB.

Altri spazi colore RGB

Bibliografia

The AdobeRGB(1998) Specification, May 2005 (PDF) (PDF), su adobe.com.

Collegamenti esterni

Working Space Comparison: sRGB vs. Adobe RGB 1998, su cambridgeincolour.com.
Adobe Magazine discussion of the new format (PDF) (PDF), su adobe.com. URL consultato il 4 maggio 2019 (archiviato dall'url originale il 14 marzo 2013).
Adobe RGB (1998) color image encoding, su adobe.com.

V · D · M Spazio dei colori
Elenco di spazi di colori · Modello di colore
CAM	CIECAM02 · iCAM
CIE	CIEXYZ · CIELAB · CIECAM02 · CIELUV · Yuv · CIEUVW · CIE RGB
RGB	RGB · sRGB · RG chromaticity · Adobe · Wide Gamut · DCI-P3 · ProPhoto · scRGB · Rec. 709 · Rec. 2020
YUV	YUV · PAL · YDbDr · SÉCAM · YIQ · NTSC · YCbCr · Rec. 601 · Rec. 709 · Rec. 2020 · YPbPr · xvYCC · YCgCo
Altri	BGR233 · CcMmYK · CMYK · Coloroid · LMS · Esacromia · HSL, HSV · HCL · Colore impossibile · OSA-UCS · PCCS · RG · Modello di colore RYB
Sistemi di colore e standard	ANPA · Indice internazionale dei coloranti (Elenco di coloranti) · DIC · Federal Standard 595 · HKS · ISCC–NBS · Munsell · NCS · Ostwald · Pantone · RAL

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