Golang Realizes pdf to high definition jpeg

ImageMagick It is a feature-rich image processing tool

For specific installation methods, please refer to the official. You can install them through homebrew on MacOS.

brew install imagemagick@6

The latest source of homebrew is version 7.*. Since my scenario needs to be deployed on Linux, the apt source of linux is currently 6.9. In order to be consistent, the old version is used.

Command line usage

convert -density 128  -quality 100 -alpha remove

Golang code usage

Core points:

pdf needs to remove the alpha channel, and then set the background color white (you can set other colors according to your needs) to pay attention to memory leakage, because this is cgo, and once it is leaked, it will be gg. For example, you don't()The above density setting is resolution. You need to set a reasonable value, otherwise the converted picture will be blurred.

The binding installation method of golang can be as follows github introduction/gographics/imagick

package main

import (
	"fmt"
	"io/ioutil"
	"runtime"
	"runtime/debug"
	"time"

	"/gographics/imagick.v2/imagick"
)

func main() {
	()
	//defer ()
	data, _ := ("")

	start := ()
	for i := 0; i < 100; i++ {
		if i%10 == 0 {
			("i", i)
		}
		go createCoverImage(data, "")
	}
	("duration", ().Sub(start))
	PrintMemUsage()
	()
	PrintMemUsage()
	(10 * )
	()
	("free cgo")
	PrintMemUsage()
	(10 * )
}

// PrintMemUsage outputs the current, total and OS memory being used. As well as the number
// of garage collection cycles completed.
func PrintMemUsage() {
	var m 
	(&m)
	// For info on each, see: /pkg/runtime/#MemStats
	("Alloc = %v MiB", bToMb())
	("\tTotalAlloc = %v MiB", bToMb())
	("\tSys = %v MiB", bToMb())
	("\tNumGC = %v\n", )
}

func bToMb(b uint64) uint64 {
	return b / 1024 / 1024
}

func clearImagickWand(mw *) {
	()
	()
	()
	//(mw, nil)
	mw = nil
}

func createCoverImage(data []byte, coverPathName string) bool {
	//sourceImagePath := getSourceImageForCover((pathNoExtension))
	mw := ()
	defer clearImagickWand(mw)
	(192, 192)
	err := (data)
	if err != nil {
		return false
	}

	//length := ()
	//("length", length)
	//("width", ())
	//("height", ())

	pix := ()
	("white")
	//(pix)
	(imagick.ALPHA_CHANNEL_REMOVE)
	("jpeg")

	err = (coverPathName)
	if err != nil {
		return false
	}
	_ = ()

	return true
}

In particular, two environment variables need to be set

export CGO_CFLAGS_ALLOW='-Xpreprocessor'
export PKG_CONFIG_PATH="/usr/local/opt/imagemagick@6/lib/pkgconfig" # Depends on the output of brew install

Golang PDF to JPEG

package main

import (
	"fmt"
	"os"

	"/h2non/bimg"
)

func main() {
	buffer, err := ("")
	if err != nil {
		(, err)
	}

	newImage, err := (buffer).Convert()
	if err != nil {
		(, err)
	}

	if (newImage).Type() == "jpeg" {
		(, "The image was converted into jpeg")
	}

	("", newImage)
}

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