epubimagefilters

func AutoContrast ¶ added in v2.6.1

func AutoContrast() gift.Filter

AutoContrast Automatically improve contrast

func AutoCrop ¶

func AutoCrop(img image.Image, bounds image.Rectangle, cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom int, limit int, skipIfLimitReached bool) gift.Filter

AutoCrop Lookup for margin and crop

func CoverTitle ¶

func CoverTitle(title string, align string, pctWidth int, pctMargin int, maxFontSize int, borderSize int) gift.Filter

CoverTitle Create a title with the cover image

func CropSplitDoublePage ¶

func CropSplitDoublePage(right bool) gift.Filter

CropSplitDoublePage Cut a double page in 2 part: left and right.

This will cut in the middle of the page.

func Pixel ¶

func Pixel() gift.Filter

Pixel Generate a blank pixel 1x1, if the size of the image is 0x0.

An image 0x0 is not a valid image, and failed to read.