Modify image contrast and colours


Original imageModified Image
Unmodified image Modified using colorize
<?php
    exec("convert House.jpg -fill black -colorize 15% colorize.png");
    ?>

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Unmodified image Modified using contrast-stretch
<?php
    exec("convert House.jpg -contrast-stretch 2% stretch.png");
    ?>

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Unmodified image Modified using level
<?php
    exec("convert House.jpg -level 5%,95%,0.8 level.png");
    ?>

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Unmodified image Modified using normalize
<?php
    exec("convert House.jpg -normalize normalize.png");
    ?>

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Unmodified image Modified using sigmoidal-contrast
<?php
    exec("convert House.jpg -sigmoidal-contrast 3,75% sigmoidal.png");
    ?>

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