Image files

You need to be aware that the AVT pays attention to the mode you are
in when you select SAVE SSTV and LOAD SSTV from the project menu.

If you are in a color mode (111, Robot composite {cmp}, AVT) then the
AVT system will save and load all three buffers into one file.
Depending on the particulr mode, that is, whether it is hi-res or lo-res,
the file extension is changed between these three:

.Ahi, high, and .low

If you are in a B&W mode, again, depending on the resolution, the
file extension is changed between these two:

.bwh and .bwl

Be careful - make sure the extension that you expected is in the
extension box in the file requetser - if it's not, you were probably in
the wrong mode when you selected the file requester. CANCEL the
requester, select the proper mode for the file you are saving, and
select save (or load) again.

File Sizes:

STVm
.bwl  -   16384 bytes    32 blocks
.bwh  -   65536 bytes   256 blocks
.low  -   49152 bytes    96 blocks
.high -  196605 bytes   768 blocks

FAX
.fax  -  614400 bytes  1200 blocks

Using the File Requester
 
 The file requester used in  this  program  is  a very powerful mouse driven
 type developed by Black Belt Systems for use in it's products.
 
 The file requester has three  main  areas.  These  are  a LIST area, a TEXT
 area, and a CONTROL BUTTON area.
 
 The LIST area contains three independant lists. Each list is constructed in
 the same manner.
 
 There are eight available "slots" in a  list. To the left of each "slot" is
 a "select button" that may be pressed to select that item in the list.
 
 To the right of each list is a standard proportional gadget, and two "arrow
 buttons". If there are more than  eight  entries in a particular list, then
 the knob in the prop gadget will shorten,  and you will be able to scan the
 items in the list by moving the knob with your mouse.
 
 Additionally, you may choose  to  point  at  and "press" the arrow buttons,
 which will move the items through the list one at a time.
 
 Note that the "slot", or the text  area,  is a string gadget; you can, if a
 name in the list is too long to see,  point  and click within the text slot
 and use the cursor keys to scroll the item through the slot horizontally in
 order to read it in it's entirety.
 
 The leftmost list is a list  of  FILES  that  are in the currently selected
 directory. Items in the FILE list will only show if (A), they have the same
 extension as is specified in the  "Extension:"  field  of the text area, or
 (B), if the "Extension:" field of the text area is blank.
 
 The center list is a list  of  VOLUMES  that  are currently mounted in your
 Amiga's filesystem. This list may also  display any "Assigned" volume names
 active in your system if the "Assigns" control button is selected.
 
 The rightmost list is a  list  of  DIRECTORIES  that  are  in the currently
 selected directory.
 
 The TEXT area of the file requester contains  five individual text gadgets.
 Four are for your use,  and  one,  the  "Messages:"  one,  is  for the file
 requester's use in telling you  what  is  going  on with operations you are
 asking it to do. Those provided for your use are used as follows:
 
 PATH:
 This item is used to control  where  the  file  requester  "looks" for it's
 lists of directories and files. You can  type into this item at any time by
 pointing into it with the mouse and  clicking  once.  You can also set this
 item to a particular position in the filesystem by selecting items from the
 list of DIRECTORIES, items from  the  list  of  VOLUMES, or by pressing the
 PARENT control button. If you elect  to  type  into it, make sure you press
 one of the ENTER or RETURN keys on  the  keyboard when you are done editing
 the information inside the PATH item. This forces the file requester to try
 and find that directory in the Amiga's filesystem.
 
 FILE:
 This item is used to determine the actual  file that the operation the file
 requester was invoked to perform  will  use as it's target. You can fill in
 this entry by hand, or by pressing a SELECT button in the FILE list. If you
 enter a file name in here and it  does  not exist in the current directory,
 then a message to that effect will  appear  in the "Messages:" item. If you
 have an extension specifed in the  "Extension:"  field,  then the file name
 will NOT have it's extension in the  filename  area.  If you do not have an
 extension specified, the file WILL have it's extension.
 
 EXTENSION:
 This is an optional field that, if  filled  in, will force the requester to
 only show files in the FILE list  that  have a matching trailing extension.
 If it is empty, then all files in the directory will show in the FILE list.

 COMMENT:
 This item is used to show you  comments  that are associated with files you
 select. If you are going to be  creating  a new file, or writing out an old
 one, you can enter text into this item and it will be written with the file
 as a standard AmigaDOS comment.
 
 The CONTROL BUTTON area provides  seven  different control operations. Each
 is defined in the following section;
 
 <---->:
 The first button will appear  with  different  legends  inside  it, such as
 load, save, send, capture, and so  on.  Pressing this button will close the
 file requester and inform the main  program  that  you wish to proceed with
 the chosen operation, and that you wish to use the file you selected.
 
 CANCEL:
 Pressing this button will close  the  file  requester  and  inform the main
 program that you wish to CANCEL the  chosen  operation. The file you chose,
 if any, is ignored completely.
 
 PARENT:
 Pressing this button causes the file requester  to move "back" one level in
 the file structure, unless it is  already  at  the root of the volume it is
 working on.
 
 DELETE:
 Pressing this button will delete the  file  you  have chosen using the file
 requester. The file requester does NOT  terminate, but allows you to select
 another operation instead.
 
 SORT:
 This is a "one-shot" sort button. All three lists are sorted alphabetically
 into ascending order. Using this button  can help you to easily find a file
 or directory when the lists are large and hard to manage.
 
 SORTLOCK:
 This is like the Shift-Lock key on your keyboard; if you prefer to have the
 sort function always operate when  you  are  using the file requester, then
 press this button. Each time the  file  requester  is brought up, the lists
 will be sorted  for  you.  Pressing  the  button  again  will  turn off the
 function.
 
 ASSIGNS:
 This button is also a lock type  function.  It changes the center list from
 showing only volumes to showing volumes AND "assigns". This can be handy if
 your system is heavily salted  with  assigned  volume  names.  Pressing the
 button again will turn off the function.