One of the needs I personally ran into was the need to change the brightness, contrast and temperature of images. To solve this problem, I added the enhance
object to the JSON configs options.
enhance
can take one or more of five properties each one having a value from -100
to 100
. A negative value causes a decrease and a positive an increase.
The enhance
JSON object can have the following properties.
brightness
Positive values cause the image to be brighter. Negative values make it darker.color
Positive values increase the color saturation. Negative values make it more grayscale.contrast
Positive values increases the use of edge of spectrum colors. Negative values increase middle of spectrum colors.sharpness
Positive values increase the contrast between adjoining pixels. Negative values decrease the contrast between adjoining pixels.temperature
Positive values increase the amount of red in the image. Negative values increase the amount of blue in the image.
Note:
enhance
object.
This gives greater control over how your image is enhanced. For instance, you can change the contrast
, then the temperature
, and then the color
.
Using the max value (-100
or 100
) is pretty extreme. Most enhancements should be under between -20
and 20
. This is designed to allow minor tweaks to the images that are being crunched. It will not replace Photoshop. Sorry!
Example JSON Config
{
"directory": "C:\\Path to images\\backgrounds",
"output": "C:\\Path to images\\backgrounds\\crunched",
"recursive": true,
"versions": [
{
"comment": "Enhanced background images",
"file_format": "JPEG",
"quality": 70,
"width": 1920,
"height": 1080,
"append": "-bg",
"keep_metadata": false,
"enhance": {
"brightness": 10,
"temperature": -15,
"contrast": 10,
"color": -10
}
}
]
}