GrayView is a basic grayscale image viewer (and later, editor) for
early Macs that was initially developed in order to display
ThunderScan "SCAN" files and convert them into 32-gray shade images.

From the Read Me for v1.9.8a4:

> [GrayView] started as a program to display [ThunderScan][1]? SCAN
> files in true gray scales on a Mac II. [GrayView's author, David
> Fry,] completed that phase of the program in August of 1987 and
> freely distributed early versions on bulletin boards and via user
> groups. The latest public version of that software was 1.16. It did
> nothing more than display and save PICT files, and allowed you to
> save pictures as StartupScreens.
>
> In September of 1987 [Fry] decided that [he] wanted [GrayView] to do
> real things so [he] set to the task of adding various MacPaint-like
> features and trying to understand what it was that people would want
> to do with gray scale and color pictures. [Fry] had never written
> real MacPrograms before, and [had] no experience or training in
> graphics programming. [Fry] started discussions with people about
> commercial distribution; that was very encouraging and [he] fully
> intended to sell the final version. [ImageStudio][2] started to
> become known at this point, obvious competition. [Fry] worked
> intensely on GrayView for two months. [He] worked hard to make it
> commercial quality, with pleasant dialog boxes, low memory warnings,
> etc.
>
> But [Fry was] a graduate student in mathematics [at the time] and
> the program was taking a lot of time from [his] studies. [He]
> finally decided in December [of 1987] to halt work on GrayView,
> cancel discussions with distributors, and move on. [Fry] wasn't sure
> if [he'd] ever want to sell the program later so [he] never released
> it wide spread, like the earlier versions.

DL#1: v1.01
DL#2: v1.16 - adds compatibility with MultiFinder
DL#3: an alternate archive of 1.16
DL#4: 1.9.8a4 - adds very basic editing capabilities, but was left
unfinished

The downloads on this page were sourced from [Mac Giga-ROM 2.0][3], as
well as [Giga-ROM 4.0][4].

Compatibility
Architecture: 68k

  [1]: https://www.folklore.org/StoryView.py?project=Macintosh&story=Thunderscan.txt
  [2]: http://macintoshgarden.org/apps/imagestudio
  [3]: http://macintoshgarden.org/apps/mac-giga-rom-20
  [4]: http://macintoshgarden.org/apps/mac-giga-rom-40-1993-apps-utilities-games