Sam,
if it´s already raster graphic:
Mode RGB
Hue/Saturation
Colorize (bottom right in PhS7 H/S menue)
Adjust e.g. H=240, S=1, L=1 (fully saturated blue)
If it´s vector graphic then don´t use PhS. The result will be rastered. Illustrator should work.
Or a simple text editor (WordPad). Replace color settings by r g b setrgbcolor
e.g.
0 0 1 setrgbcolor
Grayscale: replace
g setgray
RGB: replace
r g b setrgbcolor
CMYK: replace
c m y k setcmykcolor
All numbers g, r,g,b, c,m,y,k are in the range 0.0 .. 1.0. There are some other color spaces. Then it´s not as simple.
Save as plain text as *.eps.
Best regards –GernotHoffmann
Thanks Gernot — comprehensive!
I’ll give both methods a try. (Obviously, opening the vector graphic in Illustrator is a sensible option — I just don’t have it installed here. In fact, I was trying to help another user working with The Gimp.)
Sam
Gernot
One other question…
I used your Hue/Saturation > Colorize method, but when I set the HSB values to the equivalent of the RGB colour I want (219, 100, 84 for #004AD5) I get a different, paler blue.
Any idea what’s going on?
Sam
Sam,
first a strange observation: the Lightness scale in Hue/Saturation is not the same as Brightness in HSB. But maybe an adjustment by appearance is sufficient here.
Your values RGB are a desaturated red (wrong order BGR instead of RGB ? ), and your hex values don´t match.
We can forget the hex numbers and consider only RGB versus HSB for blue:
Imagine a color cube RGB:
1. For all values R=0,G=0,B=0..255 we´ll get fully saturated blue from dark blue (black) to vibrant blue.
2. The blue is desaturated if we add white by EQUAL amounts of the two other colors:
R=0..255, G=0..255, B=255
The end point of this path is white.
The same path in HSB: 1 means 100%
1. H=240, S=1, B=0..1
2. H=240, S=1..0, B=1
Of course any other path is possible.
For an illustration one may want a blue like this:
H=240, S=0.5, B=1 (not explicitly tested, depends on the rest of the graphic).
Fully saturated blues are not printable, by the way.
Hope this helps for further experiments.
Best regards –Gernot Hoffmann
Thanks again, Gernot.
The numbers I gave were for the (hex) value 004AD5 which, when entered in the Photoshop color picker gives 219, 100, 84 for HSB. In decimal that means R = 0, G = 74, B = 213, doesn’t it?
Sam
Sam,
I see, the numbers 219 .. are for HSB; but the hex values are always for RGB. They are quite useless, with the excep- tion of stone-age HTML.
Best regards –Gernot Hoffmann
They are quite useless, with the excep- tion of stone-age HTML
🙂
