[image->ishex]

Description

Sample Usage

local(i) = image('somefile.jpg')

#i->isblack ? fail(-1,'Error, image is solid black')

#i->iswhite ? fail(-1,'Error, image is solid white')

#i->ishex('#FF0000') ? fail(-1,'Red is not welcome here')

Source Code

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define image->ishex(hex::string,units::integer=8) => {
	// 	Example usage: 
	//	image('myimage.jpg')->ishex('#FF0000') ? fail(-1,'Red is not welcome here')

	local(
		x = .width / #units,
		y = .height / #units,
		i = 0
	)
	
	while(#i < #units) => {
		.pixel(#i * #x,#i * #y,-hex)->asstring != #hex ? return false
		.pixel((#units - #i) * #x -1,(#units - #i) * #y -1,-hex)->asstring != #hex ? return false
		#i++
	}

	return true	
}

define image->isblack => .ishex('#000000')	
define image->iswhite => .ishex('#FFFFFF')

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