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add brightness and contrast options

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This commit is contained in:
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>...

54
cbconvert.go
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@@ -83,27 +83,29 @@ var (
// Command line options
type options struct {
ToPNG bool // encode images to PNG instead of JPEG
ToBMP bool // encode images to 4-Bit BMP (16 colors) instead of JPEG
ToGIF bool // encode images to GIF instead of JPEG
ToTIFF bool // encode images to TIFF instead of JPEG
Quality int // JPEG image quality
Width int // image width
Height int // image height
Fit bool // Best fit for required width and height
Filter int // 0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos
RGB bool // convert images that have RGB colorspace
NonImage bool // Leave non image files in archive
Suffix string // add suffix to file basename
Cover bool // extract cover
Thumbnail bool // extract cover thumbnail (freedesktop spec.)
Outdir string // output directory
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
Recursive bool // process subdirectories recursively
Size int64 // process only files larger then size (in MB)
Quiet bool // hide console output
ToPNG bool // encode images to PNG instead of JPEG
ToBMP bool // encode images to 4-Bit BMP (16 colors) instead of JPEG
ToGIF bool // encode images to GIF instead of JPEG
ToTIFF bool // encode images to TIFF instead of JPEG
Quality int // JPEG image quality
Width int // image width
Height int // image height
Fit bool // Best fit for required width and height
Filter int // 0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos
RGB bool // convert images that have RGB colorspace
NonImage bool // Leave non image files in archive
Suffix string // add suffix to file basename
Cover bool // extract cover
Thumbnail bool // extract cover thumbnail (freedesktop spec.)
Outdir string // output directory
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
}
// Command line arguments
@@ -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")