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• Plot the quality scores of reads in a tile as color-coded pixels in 2D
• Read tile numbers, coordinates and scores from a regular fastq file format

Use:

python tile_visual_quality.py fastq_file_name image_output_name [--ngrid int --tile int --base int --encoding str]

1. options in [] are optional, --ngrid controls the resolution, --tile selects the tile to be plotted, --base selects the base position for which the score is calculated, range from 0 to k-1, where the read length is k

2. default ngrid is 500, default tile is all

3. if no base position is specified, the median of the score across all (ex: 36) bases is used for every read

4. encoding type: 'sanger', 'illumina1.0' or 'illumina1.3', default is 'illumina1.3'

5. Requires python packages argparse, sys, matplotlib, numpy

Example:

python tile_visual_quality.py data.fastq tile.png --ngrid 500 --tile 10 --base 5 --encoding 'illumina1.3'

Links:

FASTQ format
Score encoding