On Tuesday April 03 2007 6:02 pm, C Gaskell Brown wrote:
> Thanks for the kind reply. I understand the process you describe.
> But what I am trying to do is open a document in Writer, insert a
> sketch and then alter the colour to match an RGB profile. After
> inserting the image a Picture bar appears; I click on Colour
> (Color!) and a drop down bar appears (see attached) This is marked
> in percentages,and has buttons for brightness, contrast, and gamma.
> The RGB numbers on the main palette are not percentages. Can I
> convert them in some way?
> Cynthia
I am not sure that this answers your question either. However,
what your are doing with the Picture bar just adds or subtracts the
percentage of the colour from what is already there. If you want to
know what you have added or subtracted for each part of the RBG for
each pixel of the picture, do the following. Create a new colour in
Tools > OpenOffice.org > Color as I described earlier. RGB values are
calculated by multiplying the percentages by 256 and then subtracting
1 from the product. (RGB values run from 0 to 255 rather than from 1
to 256.) For example, Magenta has an RGB of 255, 0, 255. If you have
a picture in which you change the percentages from the Picture
toolbar to 100% (R), 0% (G), and 100% (B), the resulting added hue is
Magenta.
Dan
> ----- Original Message -----
> From: "Dan Lewis" <
> To: <[email protected]>
> Cc: "C Gaskell Brown" <[EMAIL PROTECTED]>
> Sent: Tuesday, April 03, 2007 8:54 PM
> Subject: Re: [users] Color bar in "Draw" and RGB
>
> > On Tuesday April 03 2007 5:31 am, C Gaskell Brown wrote:
> >> Please can you tell me how to match the colors on the Color Bar
> >> which opens in "Draw" to an RGB code?
> >>
> >> I found the following response (see below) when I searched on
> >> Help. I am afraid I don't understand the message as I downloaded
> >> the programme as it came.
> >>
> >> I often open a black and white drawing then adjust the spin
> >> wheels randomly until I get the approximate color.
> >>
> >> But when I want to match it up with the existing RGB in your
> >> color palette such as "Red 8" and the figures don't match up.
> >> For example the RGB code on the palette for Red 8 is R153, G40,
> >> B76 . The figures on the Color bar are percentages only. I
> >> would also like more information about how to use the other
> >> buttons on this bar. Is there an appropriate tutorial?
> >>
> >> I would be grateful for help as this programme is the only one I
> >> have found that easily allows a back and white sketch to be
> >> changed into a colour line drawing as well as having an
> >> excellent Charcoal filter.
> >>
> >> Many thanks
> >>
> >> Cynthia
> >> Cornwall,UK
> >
> > To add colours to the system, use
> > Tools > Options > Openoffice.org > Colors. Remove the name in the
> > Name box, add a name you want to use, and click the Add button.
> > If the name is only added to the Color dropdown list, click the
> > Edit button. The Color window opens. You should be able to create
> > whatever colour you want with the controls in this window.
> > (The reason I used color is part of my description is because
> > that is the way it is spelled in OOo in those places. OOo uses
> > the US spelling in its menus.)
> >
> > Dan
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