You might try creating a new white layer and placing it at the bottom
of the layerstack to show the regions where your image is transparent.
At last I am beginning to understand. The white shows where before there
was the grey and white squares layer. Brilliant thank you.
Norman
I would like to be able to produce a black and white negative image from
an ordinary colour image. The effect I would like to produce would be to
imitate what one would get if you took a colour, positive transparency
and made a contact print on to either orthographic or lithographic film.
Thus,
On Thursday 25 October 2007 10:18, norman wrote:
I would like to be able to produce a black and white negative image
from an ordinary colour image. The effect I would like to produce
would be to imitate what one would get if you took a colour,
positive transparency and made a contact print on
On Thursday 25 October 2007 23:18:04 norman wrote:
I would like to be able to produce a black and white negative
image from an ordinary colour image.
I'm lazy, so desaturating on luminosity works well enough for
me. If I wanted to alter the colours, I'd put the image through
a colour-map first.
I would like to be able to produce a black and white negative image
from an ordinary colour image. The effect I would like to produce
would be to imitate what one would get if you took a colour,
positive transparency and made a contact print on to either
orthographic or lithographic
snip
Decompose you image to RGB components.
In the new image, hide the red and green layers.
Add a layermask to the blue layer, initialized to a Grayscale copy of
the layer.
Fill the blue layer with black.
OPTIONAL: Most orthochromatic film would respond to some extent to
green,
There should be no white in the resulting image. When you decompose to
RGB (Colors-Components-Decompose), you end up with a grayscale
image with three layers -- one each for the red, green, and blue
components.
When you add the layermasks, you are basically making the the black
parts of
Oops, I just realized that what you describe may be attributed to the
fact that GIMP will display a dark gray/light gray checkerboard to
indicate transparent regions. Perhaps you have created your lithograph
correctly but misinterpreted this representation of transparency.
You might try
