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17 Bit Software 3: The Continuation
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robotcolor.doc
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1994-01-27
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The AVT and Robot Color
The AVT supports all the new Robot modes as implemented in the 400c,
450c, and 1200c - including the Automatic receive modes.
Operating the Black and white modes is perfectly straightforward. You
pick the speed, the memory (R, G or B) and go.
For color, things are somewhat different. Robot elected to implement a
pseudo-composite format that, in this version of the AVT software, must
be processed after reception. This is done automatically, and is
fairly quick. You'll note a small cursor running down the side of the
screen - that indicates how much of the received image has been
processed. Once the image has been processed, it will be displayed as
appropriate.
For Robot color, you'll need to pick the speed, press the composite button
(next to the RGB buttons on the left), and then either receive an image
or convert for transmit, as explained next.
For transmit, the same proceedure must be followed, in reverse.
Note the "RoboSynth" ICON on the control panel. If you position the mouse
over this icon and click the left button, a window will open with four
buttons in it that are visually identical to the Robot mode buttons
in the main control panel.
Remember that 12 and 24 second are 128x128 (low-res) and 36 and 72
second are 256x240 (hi-res).
If you have an image loaded (or receieved) in either the hi or low
resolutions, you can ready it in this window for robot transmit.
If it is a low res image (that is, you received it in ANY mode that
is a low-res mode [see the chart in the
Grab.doc
file for
details on which modes are whice), then it is ready to convert into
either 12 or 24 second, just by pressing the appropriate button.
If you recieved the image in hi-res, however, you must either transmit it
in hi res (either 36 or 72) or you'll need to change it's resolution
before trying to send it in lo-res. This is easily accomplished by
pressing the
>128
button. It means "convert to 128x128 from
hi-res. Conversely, if you are in lo-res, say for instance that you
received the image in 24 second composite or perhaps 24 second AVT,
you'll need to convert it UP in resolution.
This is done with the
>256
button, in this same window. Once
converted (You'll know it's done because the little "light" on the
button will go out) You can press either of the 36 or 72 buttons and
it will be prepared for transmit.
There is a special memory area (buffer) maintained in the program
for use with Robot Color images. This area is what receives the
"compiled" transmit record that is prepared by pressing any of the
Robot TX conversion buttons. You know when you have a valid image that
is ready to transmit because there are four little simulated "LEDs"
at the lower right of the control panel, with 12, 24, 36, and 72
marked under them. When the buffer has an image ready for transmit,
the appropriate LED will be lit. If there is no image ready for
transmit (perhaps because you changed modes, or loaded a new image
from disk) There will be no LEDs lit, and you will NOT be able to
transmit composite color - pressing the TX button will have no
effect.
It is very important that you use the Scope to aid you if you wish to use
the Robot "Automatic" mode. You need to be
Exactly
on the same
frequency that the transmitting station is in order for the automatic to
work. The AVT does NOT implement the Auto-tune function found in the 450c
and the 1200c - We found that running that type of tuning system
causes a severe loss of sensitivity, and opted to leave it out.
If you do happen to receive an Robot composite image off-frequency,
you will notice that the image is "tinted" the wrong color. If you were
too high in frequency, it will be reddish; if you were too low,
it will be greenish. In the Robosynth window, you will see a slider,
called a proportional gadget in Amiga terminology, that can adjust the
tint of a received Robot image. There is a caveat to using this
function, though - you MUST use it immediately after you receive the
composite image, as the received image is maintained in the same buffer
that is used for transmission, and it will be replaced if you do anything
at ALL like change to another mode, transmit an image, load an image,
etc.
For higher quality images, and an extremely sensitive and reliable
automatic mode, try the AVT modes; they are far superior to the
Robot modes in any case - inherently better, top to bottom.