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Fixes in 2018/bellard

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Fix command in README.md for macOS:

    -preview lena.ppm # On MacOS
    +open -a Preview lena.ppm # On macOS

Move warning that the program does not protect against invalid input to
the top of the author's comments (seems the best place).

Format fixes.

Add to .gitignore files that are generated by suggested commands.
This commit is contained in:
Cody Boone Ferguson committed 2023-04-01 06:43:47 -07:00
1 parent 51939ecc17
commit 94f1d659ba
2 files changed
+17 -11
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2018/bellard/.gitignore
+3
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@@ -1,3 +1,6 @@
lena.ppm
prog
small.jpg
fruits.ppm
lena512.ppm
vintage_cars.ppm
2018/bellard/README.md
+14 -11
View File
@@ -19,7 +19,7 @@ make
```sh
eog lena.ppm # On Linux
preview lena.ppm # On MacOS
open -a Preview lena.ppm # On macOS
pngtopnm < Lenna.png | pnmscale 0.25 | cjpeg -arithmetic -dct float -quality 14 > small.jpg
```
@@ -27,22 +27,25 @@ pngtopnm < Lenna.png | pnmscale 0.25 | cjpeg -arithmetic -dct float -quality 14
## Judges' comments:
The file `small.jpg` will be approximately of the same size as the raw image data
in the program. Compare the level of the detail and the artifacts of
The file `small.jpg` will be approximately of the same size as the raw image
data in the program. Compare the level of the detail and the artifacts of
`small.jpg` and `lena.ppm`.
Compressing images is just a matter of simple arithmetic and some magic, isn't it?
Compressing images is just a matter of simple arithmetic and some magic, isn't
it?
We could understand some of the arithmetic but none of the magic.
Deciphering the mechanism used for data encoding to make use
of whitespace, braces and semicolons should be a slightly easier task.
Deciphering the mechanism used for data encoding to make use of whitespace,
braces and semicolons should be a slightly easier task.
## Author's comments:
This program outputs a 128x128 RGB image file to the standard output
using the portable pixmap file format (PPM). It contains the famous
"Lena" image which is used in many image compression tests.
Warning: the program is not protected against invalid input.
This program outputs a 128x128 RGB image file to the standard output using the
portable pixmap file format (PPM). It contains the famous "Lena" image which is
used in many image compression tests.
The uncompressed image is 12 times larger than the source code of the
program which includes the image data and the complete decoder. The
@@ -73,8 +76,8 @@ input. Examples:
```
The original images for [fruits][1] and [vintage cars][2] come from
Wikipedia and were resized to a width of 1024 pixels. Warning: the
program is not protected against invalid input.
Wikipedia and were resized to a width of 1024 pixels.
The program should be portable on any Unix system. On Windows the line
`_setmode(0, 32768); _setmode(1, 32768);` must be added at the start of