Sets a variety of modifiable properties for each screen object or image.
Copy tables - Copies the colormap, gamma table, or calibration parameters from some other image.
Color type - Sets the `colortype' flag for the image to Grayscale, Indexed, or Color. Warning: Changing color types is not always a reversible process.
Image Number - Sets the source and destination image numbers for the `copy tables' option.
Image attributes - Sets the title, position, image depth, and transparency (see Sec. 7.3 for the image.
Transparency
Checking the ``Transparent'' button in the ``Image properties'' dialog causes all the pixels in the image to be treated as transparent. This means that images behind the transparent image or on the background will partially show through.
Note. The transparency feature still has some minor limitations:
(1). Best results are obtained by starting the X server in a color mode (16 or 24 bits/pixel). With XFree86, this can be done with the command ``startx - -bpp 16''.
(2). If the image does not appear transparent after performing some operation, moving the image by clicking on the arrow buttons should restore the transparent effect.
(3). No conversion between pixel types or image depths is currently performed by the ``Paste'' button.
(4). Saving images as transparent GIFs is not yet supported.
(5). Transparency can be slow with color images, because calculating the new pixel value requires fetching and performing calculations on the RGB values for both the foreground and background. This can take up to several seconds for a large image. If possible, convert the image to grayscale first.
(6). All images must be the same bits/pixel as the display. Use ``change image depth'' if necessary to convert the images.
(7). Multiple transparent images may be superimposed in as many layers as desired. Bear in mind that if the background is not black, the background will also show through a transparent image.
(9). Before using the ``Create/Resize Image'' function to create a new composite image from a region of the screen containing one or more transparent images, or performing some other operation such as image warping, the images should be converted to the same bits/pixel as the display in order to obtain satisfactory results.
To change the transparency settings, select ``Image..image properties..'' (or click the ``Prop'' button at left), and set the ``Transparency'' value to the desired value (0=completely opaque, 100=completely transparent).
To deactivate transparency, simply set the transparency value to 0.