add license, fix readme

Signed-off-by: Jaime Silvela <[email protected]>

Author: jsilvela

LICENSE.txt

@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) Jaime Silvela
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -4,7 +4,7 @@ I wrote this code in 2001 for my thesis on image processing, and
 from that I got an article published:
 
 *Breadth-First Search and Its Application to Image Processing Problems*,
-published IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 10, NO. 8, AUGUST 2001.
+published on IEEE Transactions on Image Processing, VOL. 10, NO. 8, August 2001.
 [link](https://silvela.org/jaime/BFSpaper.pdf)
 
 I have made no functionality change since then, nor have I tried to update
@@ -14,14 +14,14 @@ Tested on a Raspberry Pi running *stretch*, May 2022.
 
 ## Installing
 
-You need libtiff to be installed.
+You need `libtiff` to be installed.
 In a Debian-derived system:
 
 ``` sh
 apt-get install libtiff libtiff-dev
 ```
 
-If you want to run the GTK+ gui bit, you will need libgtk-dev
+If you want to run the GTK+ UI, you will need `libgtk-dev`
 too. This was developed way back when, on GTK+ version 2.
 
 ``` sh
@@ -47,12 +47,13 @@ The two executables take in a single TIFF image as input, and after
 starting, become a command-line interpreter.
 
 For example, we start processing the image `manos/a30000.tif`.
-In the terminal where we fired the executables, we type:
+In the terminal:
 
 ``` sh
 ./pro-gtk-image manos/a30000.tif
 ```
 
+Now, we can use the terminal as a REPL.
 One or more commands may be issued, followed by a newline.
 After each, a GTK+ window will display the result of the command.
 
@@ -62,24 +63,26 @@ E.g.
 threshold 100
 ```
 
--> a window opens showing the image after thresholding
+→ a window opens showing the image after thresholding
 
 ``` sh
 regions
 ```
 
--> a window opens showing the image after cleaning the noisy regions
+→ a window opens showing the image after cleaning the noisy regions
 
-The commands may also be chained. An window will open after each command.
+The commands may also be chained. For example:
 
 ``` sh
 threshold 100 regions
 ```
 
+… a window will open after each command.
+
 ### Non-graphical executable
 
-The non-graphical executable does not produce a window, of course.
-We should write out to a TIFF file to show progress.
+The non-graphical executable does not produce a window with the results,
+of course. We should write out to a TIFF file to show progress.
 
 ``` sh
 % ./pro-image manos/a30000.tif