OpenJDK does not have a native JPEG encoder, try using Sun’s JDK, or using a library (such as JAI AFAIK, regarding the “pinkish tint”, Java saves the JPEG as ARGB (still with transparency information). Most viewers, when opening, assume the four channels must correspond to a CMYK (not ARGB) and thus the red tint. If … Read more
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
You should be able to do something like this: using System.Drawing.Imaging; using System.Drawing; using System.IO; byte[] bitmap = GetYourImage(); using(Image image = Image.FromStream(new MemoryStream(bitmap))) { image.Save(“output.jpg”, ImageFormat.Jpeg); // Or Png } Look here for more info. Hopefully this helps.
Major reason – PNG will give you advantage of Alpha Transparency over JPG. Also see: PNG vs. GIF vs. JPEG vs. SVG – When best to use?
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
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. gif uses a color palette. You can specify that one color in the palette is fully transparent. png-8 also uses a … Read more
It’s complicated because iOS 11 is actually storing tiles of HEVC encoded images in a HEIF container, but there’s a demo using the nokia lib to extract them all, ffmpeg to decode them and then stitching them into a single jpeg with imagemagick in the heiftest repo linked from corrupted HEIC tile when converting to … Read more
It depends. PNG is better for crisp images with a low number of colours, JPG is better for a low-bandwidth image – however it is not as crisp and therefore not very good for GUI. Generally, JPG is for photos and pictures, whereas PNG (or GIF) is for layout. You may find this page interesting, … Read more
Here is a snippet addressing the 8 orientation values. First a few notes: The EXIF id 0x0112 is for Orientation. This is a helpful EXIF id reference http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html 0x0112 is the hex equivalent of 274. The data type of a PropertyItem.Id is an int, meaning 274 is what is useful here. Additionally, 5029 likely was … Read more
Try convert the image to RGB: … new_p = Image.fromarray(fft_p) if new_p.mode != ‘RGB’: new_p = new_p.convert(‘RGB’) …