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# TerminalImageViewer
# TerminalImageViewer (tiv)
Small Java\* program to display images in a (modern) terminal using RGB ANSI codes and unicode block graphic characters.
Small C++ program to display images in a (modern) terminal using RGB ANSI codes and unicode block graphic characters.
Algorithm (for each 4x8 pixel cell mapped to a unicode block graphics character):
The main difference to various existing similar tools is that instead of having two fixed pixels per character
cell utilizing the unicode half block character, this program enhances the resolution using the following algorithm:
For each 4x8 pixel cell mapped to a unicode block graphics character:
1. Find the color channel (R, G or B) that has the biggest range of values for the current cell
2. Split this range in the middle
3. Average the colors above and below and create a corresponding bitmap for the cell
3. Compare the bitmap to the assumed bitmaps for various unicode block graphics characters
2. Split this range in the middle and create a corresponding bitmap for the cell
4. Compare the bitmap to the assumed bitmaps for various unicode block graphics characters
5. Re-calculate the foregound and background colors for the chosen character.
\*) **C++ port** available at at https://github.com/stefanhaustein/tiv
## Installation
git clone https://github.com/stefanhaustein/TerminalImageViewer.git
cd TerminalImageViewer/src/main/cpp
make
sudo make install
## Usage
```
javac TerminalImageViewer.java
java TerminalImageViewer [-w <width-in-characters>] <image-filename-or-url>
```
tiv <filenames>
## Common problems
- If you see strange horizontal lines, the characters don't fully fill the character cell. Remove additional line spacing in your terminal app
- Wrong colors? Try -256 to use a 256 color palette instead of 24 bit colors or -grayscale for grayscale.
- Wrong colors? Try -256 to use a 256 color palette instead of 24 bit colors
## Examples
![Examples](http://i.imgur.com/8UyGjg8.png)