Setting jpg compression level with ImageIO in Java

I’m using javax.imageio.ImageIO to save a BufferedImage as a jpeg file. In particular, I created the following Java function: public static void getScreenShot(BufferedImage capture, Path folder, String filename) { try { ImageIO.write(capture, “jpeg”, new File(folder.toString()+”/”+filename+”.jpg”)); } catch (AWTException | IOException ex) { Logger.getLogger(ScreenShotMaker.class.getName()).log(Level.SEVERE, null, ex); } } Likewise any image manipulation software, I wish to … Read more

C# Base64 String to JPEG Image

I am trying to convert a Base64String to an image which needs to be saved locally. At the moment, my code is able to save the image but when I open the saved image, it says “Invalid Image”. Code: try { using (var imageFile = new StreamWriter(filePath)) { imageFile.Write(resizeImage.Content); imageFile.Close(); } } The Content is … Read more

Only PNG supports transparency, is that true?

I found JPG does not support transparency, the alpha value is always 255. I am wondering only png supports transparency? Answer png-32 supports different levels of transparency. Each pixel can have an opacity between 0 and 255, with 0 as completely transparent. png-24 supports setting one color as fully transparent. Everything else will be opaque. … Read more

PIL cannot write mode F to jpeg

I am taking a jpg image and using numpy’s fft2 to create/save a new image. However it throws this error “IOError: cannot write mode F as JPEG” Is there an issue with CMYK and JPEG files in PIL??? p = Image.open(‘kibera.jpg’) bw_p = p.convert(‘L’) array_p = numpy.asarray(bw_p) fft_p = abs(numpy.fft.rfft2(array_p)) new_p = Image.fromarray(fft_p) new_p.save(‘kibera0.jpg’) new_p.histogram() … Read more

Convert HEIF (.heic) to JPEG on a server? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 4 years ago. Improve this question Apple has introduced a new image format in iOS 11 called HEIF (.heic file extension). I know you can … Read more