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High quality JPEG compression with c#

The .Net encoder built-in to the library (at least the default Windows library provided by Microsoft) is pretty bad: http://b9dev.blogspot.com/2013/06/nets-built-in-jpeg-encoder-convenient.html Partial Update I’m now using an approach outlined here, that uses ImageMagick for the resize then jpegoptim for the final compression, with far better results. I realize that’s a partial answer but I’ll expand on … Read more

Convert PDF to JPEG with PHP and ImageMagick

It can be done using setResolution, but you need to do it before loading an image. Try something like this: // instantiate Imagick $im = new Imagick(); $im->setResolution(300,300); $im->readimage(‘document.pdf[0]’); $im->setImageFormat(‘jpeg’); $im->writeImage(‘thumb.jpg’); $im->clear(); $im->destroy();

How do I insert a JPEG image into a python Tkinter window?

Try this: import tkinter as tk from PIL import ImageTk, Image #This creates the main window of an application window = tk.Tk() window.title(“Join”) window.geometry(“300×300”) window.configure(background=’grey’) path = “Aaron.jpg” #Creates a Tkinter-compatible photo image, which can be used everywhere Tkinter expects an image object. img = ImageTk.PhotoImage(Image.open(path)) #The Label widget is a standard Tkinter widget used … Read more

C# Base64 String to JPEG Image

First, convert the base 64 string to an Image, then use the Image.Save method. To convert from base 64 string to Image: public Image Base64ToImage(string base64String) { // Convert base 64 string to byte[] byte[] imageBytes = Convert.FromBase64String(base64String); // Convert byte[] to Image using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length)) { Image image = … Read more

Is JPEG lossless when quality is set to 100?

As correctly answered above, using a “typical” JPEG encoder at quality 100 does not give you lossless compression. Lossless JPEG encoding exists, but it’s different in nature and seldom used. I’m just posting to say why quality 100 does not mean lossless. In JPEG compression information is mostly lost during the DCT coefficient quantization step … Read more

Use PHP to convert PNG to JPG with compression?

Do this to convert safely a PNG to JPG with the transparency in white. $image = imagecreatefrompng($filePath); $bg = imagecreatetruecolor(imagesx($image), imagesy($image)); imagefill($bg, 0, 0, imagecolorallocate($bg, 255, 255, 255)); imagealphablending($bg, TRUE); imagecopy($bg, $image, 0, 0, 0, 0, imagesx($image), imagesy($image)); imagedestroy($image); $quality = 50; // 0 = worst / smaller file, 100 = better / bigger file … Read more

Image on canvas to JPEG file

create an empty bitmap create a new Canvas object and pass this bitmap to it call view.draw(Canvas) passing it the canvas object you just created. Refer Documentation of method for details. Use Bitmap.compress() to write the contents of the bitmap to an OutputStream, file maybe. Pseudo code: Bitmap bitmap = Bitmap.createBitmap( view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888); Canvas … Read more