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add brightness and contrast options

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Milan Nikolic
2015-11-05 06:11:40 +01:00
parent 574e364954
commit 4d1e0a44d2
2 changed files with 35 additions and 21 deletions
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2
README.md
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@@ -66,6 +66,8 @@ Using
--grayscale Convert images to grayscale (monochromatic)
--rotate=0 Rotate images, valid values are 0, 90, 180, 270
--flip="none" Flip images, valid values are none, horizontal, vertical
--brightness=0 Changes the brightness of the images, must be in range (-100, 100)
--contrast=0 Changes the contrast of the images, must be in range (-100, 100)
--suffix=SUFFIX Add suffix to file basename
cover [<flags>] <args>...

12
cbconvert.go
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@@ -101,6 +101,8 @@ type options struct {
Grayscale bool // convert images to grayscale (monochromatic)
Rotate int // Rotate images, valid values are 0, 90, 180, 270
Flip string // Flip images, valid values are none, horizontal, vertical
Brightness float64 // Changes the brightness of the images, must be in range (-100, 100)
Contrast float64 // Changes the contrast of the images, must be in range (-100, 100)
Recursive bool // process subdirectories recursively
Size int64 // process only files larger then size (in MB)
Quiet bool // hide console output
@@ -194,6 +196,14 @@ func transformImage(img image.Image) image.Image {
}
}
if opts.Brightness != 0 {
i = imaging.AdjustBrightness(i, opts.Brightness)
}
if opts.Contrast != 0 {
i = imaging.AdjustContrast(i, opts.Contrast)
}
return i
}
@@ -919,6 +929,8 @@ func parseFlags() {
convert.Flag("grayscale", "Convert images to grayscale (monochromatic)").BoolVar(&opts.Grayscale)
convert.Flag("rotate", "Rotate images, valid values are 0, 90, 180, 270").Default(strconv.Itoa(0)).IntVar(&opts.Rotate)
convert.Flag("flip", "Flip images, valid values are none, horizontal, vertical").Default("none").StringVar(&opts.Flip)
convert.Flag("brightness", "Changes the brightness of the images, must be in range (-100, 100)").Default(strconv.Itoa(0)).Float64Var(&opts.Brightness)
convert.Flag("contrast", "Changes the contrast of the images, must be in range (-100, 100)").Default(strconv.Itoa(0)).Float64Var(&opts.Contrast)
convert.Flag("suffix", "Add suffix to file basename").StringVar(&opts.Suffix)
cover := kingpin.Command("cover", "Extract cover")