If you’re really interested in the technical details, check out the source code: png_optimizer.cc jpeg_optimizer.cc webp_optimizer.cc For PNG files, they use OptiPNG with some trial-and-error approach // we use these four combinations because different images seem to benefit from // different parameters and this combination of 4 seems to work best for a large // … Read more
Draw text into a temporary blank image, rotate that, then paste that onto the original image. You could wrap up the steps in a function. Good luck figuring out the exact coordinates to use – my cold-fogged brain isn’t up to it right now. This demo writes yellow text on a slant over an image: … Read more
The following script creates a transparent GIF with a red circle drawn in the middle: from PIL import Image, ImageDraw img = Image.new(‘RGBA’, (100, 100), (255, 0, 0, 0)) draw = ImageDraw.Draw(img) draw.ellipse((25, 25, 75, 75), fill=(255, 0, 0)) img.save(‘test.gif’, ‘GIF’, transparency=0) and for PNG format: img.save(‘test.png’, ‘PNG’)
You could use RenderTargetBitmap class and BitmapEncoder. Define these methods: void SaveToBmp(FrameworkElement visual, string fileName) { var encoder = new BmpBitmapEncoder(); SaveUsingEncoder(visual, fileName, encoder); } void SaveToPng(FrameworkElement visual, string fileName) { var encoder = new PngBitmapEncoder(); SaveUsingEncoder(visual, fileName, encoder); } // and so on for other encoders (if you want) void SaveUsingEncoder(FrameworkElement visual, string fileName, … Read more
The fastest way is by using unsafe code: BitmapData srcData = bm.LockBits( new Rectangle(0, 0, bm.Width, bm.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); int stride = srcData.Stride; IntPtr Scan0 = srcData.Scan0; long[] totals = new long[] {0,0,0}; int width = bm.Width; int height = bm.Height; unsafe { byte* p = (byte*) (void*) Scan0; for (int y = 0; y … Read more
The bitmap constructor has resizing built in. Bitmap original = (Bitmap)Image.FromFile(“DSC_0002.jpg”); Bitmap resized = new Bitmap(original,new Size(original.Width/4,original.Height/4)); resized.Save(“DSC_0002_thumb.jpg”); http://msdn.microsoft.com/en-us/library/0wh0045z.aspx If you want control over interpolation modes see this post.
I had the same problem and I solved that by upgrading this package using the command below: pip install -U Pillow
I came up with my own solution that I find acceptable. What I did was render the text large, like 3x the size it needs to be then scale it resize it down with antialiasing, it’s not 100% perfect, but it’s a hell of a lot better than default, and doesn’t require cairo or pango. … Read more
Yes. The Windows.Data.Pdf namespace contains many APIs that allow you to render PDFs. These APIs are available to WinRT applications, but there are ways to use certain WinRT APIs from desktop applications if that is what you need. Edit: It appears that this library can only be used in Windows RT apps and cannot be … Read more