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Amiga Format CD 11
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Amiga Format AFCD11 (Feb 1997, Issue 95).iso
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david_perks
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dfx
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dfx.doc
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1997-01-31
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DFX screen adjuster by D.Perks. Writen in AmigaE. June 94
Dfx is a small (2K) utility designed to allow alteration
of the front screen image. It was writen to address a
percieved shortcoming in DPaint- the lack of a facility for
inverting or making negative an image.
Dfx can be run from workbench or cli. It will sit at the
top of your workbench screen and will adjust the colour of
any front screen including workbench. Run it before you
load Dpaint and then pull the Dpaint screen down just
enough to show Dfx.
Dfx has the following controls:
Strip - will blank out selected bit planes. (Permanent)
Neg - will invert selected bit planes. (Toggle)
Select/deselect bit planes using the central panel.
Generally, each bit plane doubles number of colours.
00000001 =2 colour screen. 00011111 =32 colour. etc
Experiment with various combinations eg 00010110, 00001100
If used on a DPaint screen both effects will be found to be
temporary EXCEPT in the rectangle reserved by UNDO. You
can use this to your advantage by drawing a rectangle
around the section to invert, UNDO the rectangle, select
effect from Dfx and then force Dpaint to redraw its screen
by pressing F10 (or j) twice. Alternatively, select effect
from Dfx, do a brush pick up on the altered screen, then
force a screen redraw to get the original unalterted image.
The brush can then be pasted on the same screen, spare
screen or saved. It is important to experiment if you are
to understand how Dfx interacts with Dpaint.
Dfx was designed for 16 shade greyscale digitized images
but will work with most screen modes including AGA.
It does not truly invert the image but rather reverses
the current colour palette. The accuracy of this inversion
is therefore dependant on the current palette. Finer tuning
may be possible by altering bit plane selection.
Copyright remains with the author. No guarantee implied or
given. Use at your own risk.