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Java Forum / GUI / June 2004Color shade varies
Does anybody know why the same Color displays a different shade depending on whether it's drawn directly to screen or first to an off-screen buffer? Denny >Does anybody know why the same Color displays a different shade depending on >whether it's drawn directly to screen or first to an off-screen buffer? Do you have a screen driver with other than 8+8+8 colour? e.g. with windows mapped colours.  SignatureCanadian Mind Products, Roedy Green. Coaching, problem solving, economical contract programming. See http://mindprod.com/jgloss/jgloss.html for The Java Glossary. It says it's "High Color (16-bit)" > >Does anybody know why the same Color displays a different shade depending on > >whether it's drawn directly to screen or first to an off-screen buffer? [quoted text clipped - 6 lines] > Coaching, problem solving, economical contract programming. > See http://mindprod.com/jgloss/jgloss.html for The Java Glossary. >It says it's "High Color (16-bit)" Try upping that to 24 bit. I think 16 bit works with a colour palette, and each app has its own palette. The catch is when two apps are visible at once, one of the apps uses the wrong palette which makes its colours go off. In the old days video cards slowed down drastically when you went to more colours. Today you can't notice the difference. You might as well go 24 or 32 bit and be rid of the palette match problem. SignatureCanadian Mind Products, Roedy Green. Coaching, problem solving, economical contract programming. See http://mindprod.com/jgloss/jgloss.html for The Java Glossary. > I think 16 bit works with a colour palette, and each app has its own > palette. More likely, 16 bits is 5 bits red, 6 bits green and 5 bits blue. The extra bit is assigned to green because the eye is more sensitive to green than red or blue. (searching for documentation ... google ... yes: <URL: http://www.webcolors.freeserve.co.uk/chooser.htm > ) /L SignatureLasse Reichstein Nielsen - lrn@hotpop.com DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html> 'Faith without judgement merely degrades the spirit divine.' I still don't understand why the same Color displays a slightly different shade depending on whether it's drawn directly to screen or first to an off-screen buffer and then moved to the screen with drawImage(). Starting with the same Color, and ending up on the same screen, where in the process is the Color altered in the indirect draw? > > I think 16 bit works with a colour palette, and each app has its own > > palette. [quoted text clipped - 12 lines] > DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html> > 'Faith without judgement merely degrades the spirit divine.' > Does anybody know why the same Color displays a different shade depending on > whether it's drawn directly to screen or first to an off-screen buffer? I do not observe any difference in your example.. <http://www.physci.org/codes/sscce.jsp> SignatureAndrew Thompson http://www.PhySci.org/ Open-source software suite http://www.PhySci.org/codes/ Web & IT Help http://www.1point1C.org/ Science & Technology Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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