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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 1.iso
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IMAGE_1-.SPK
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!Image
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1996-09-29
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The Colour Selection Window
---------------------------
The Colour Selection window allows you to select and create 16 colours
for use in painting (see 'Painting').
The window contains three sliders at the top which show the red, green
and blue components of the current colour (between 0 (off) and 255
(fully on)).
Below these is an icon which shows the current colour (as closely as
it can, given the current mode), to the right of this 2 icons, marked
'Set' and 'Mask'.
Below this is a bank of 16 icons, (numbered 0 to 15) one for each
colour; the currently selected of these is highlighted. To select any
of these colours simply move the mouse pointer of the icon and press
SELECT.
There are two ways of altering the colours. First you need to select
the colour you want to alter, then :
either: alter the red, green and blue components using the sliders at
the top of the window,
or: (make sure you are not in the middle of a paint operation when
doing this) simply click the point pointer on a pixel in the picture
which is the colour you require.
Finally press the 'Set' icon to make the alteration permanent.
You can also set the colour used as a mask in a similar manner, simply
set the sliders up to show the desired colour and select the 'Mask'
icon to make the selection permanent.
Note: The selected mask colour will be saved when you save your
configuration; however the 16 colours will not be saved - they default
to the 16 desktop colours.
Creating a colour scale
-----------------------
It is possible to get Image to create a scale of colours between any two
defined colours. This is done by first defining the two end colours in
non-consecutive colour icons, and then SELECTING the first of these and then
selecting the other - using the ADJUST mouse button. Image will then fill the
icons between the two end icons with colours that lie in between the two end
colours.
For example, if you define colour 0 as white, and colour 15 as black, then
select 0 (using SELECT) and then select 15 (using ADJUST) you will have a 16
colour grey scale from white to black.
If the two icons selected above are next to each other, then the action Image
performs is different (it can not create a scale between two consecutive
icons). In this case the first selected colour is taken as a base colour, the
second icon (the one ADJUST selected) defines two parameters.
First of all which side the second icon is located is noted. Then the
operation will be on all icons on that side of the first icon, other than the
ADJUSTed icon. For example say you SELECT icon 7 and then ADJUST icon 8, then
icons 9 to 15 will be altered in this operation.
The second thing that the ADJUSTed icon defines is a range. It defines the
maximum deviation from the first colour. Then all the icons to be defined by
the operation (in the above example 9 to 15) will be defined randomly based
on the base colour and the maximum deviation from it. This allows you to
define colours around a base colour easily.
Creating a User Palette
-----------------------
You can create a user palette, based on the contents of an Image picture
bank, using the create palette function on the colour selector window. To
access this function you need to extend the colour selector window to its
full size. At the bottom of the window are three icons to define how many
colours to create the palette with (16, 255 or 256 - 255 is for use when
creating a GIF file with a mask).
You can also select the quality setting for the calculation of the palette.
The greater the number of bits the nearer the resultant palette will be
to the original picture, but it requires much more memory and time to
calculate (as an indication to create a 256 colour palette using 4 or 5 bit
quality requires just over 1M of memory to be free, at 6 bit this becomes
just over 2M, but at 7bit it would require about 10M).
Selecting create will cause Image to analyse the picture and generate
a 'User palette' which best matches. This palette can then be used for the
display sprite by using the configuration options (see configuration).
Palette files
-------------
If you drag a palette file to the colour selector window, and the palette
file defines <=16 colours, then the colour selector colours will become those
defined in that file.
Dragging a palette file to any other Image window will cause Image to load
the given palette into the user defined palette store (which can be used
for the display sprite by selecting the 'User Palette' option (see
'Configure').
Pressing MENU over the Colour Selector window brings up a save window which
allows you to save either the current colours in the user palette or the
current colour in the colour selector to a palette file.
Dragging a GIF or BMP file to the colour selector window will extract the
colour palette from the file and place it in the user palette.