This is the code I use. It supports rotation, and also sets the image resolution to the JPEG standards of 72dpi@24-bit color (by default GDI+ saves images at 96dpi@32-bit color). It also fixes the black/gray border problem that some people experience when resizing images. /// <summary> /// Resizes and rotates an image, keeping the original … Read more
The selection of a particular filter for image processing is something of a black art, because the main criterion for judging the result is subjective: in computer graphics, the ultimate question is almost always: “does it look good?”. There are a lot of good filters out there, and the choice between the best frequently comes … Read more
You can use the imagehash library to compare similar images. from PIL import Image import imagehash hash0 = imagehash.average_hash(Image.open(‘quora_photo.jpg’)) hash1 = imagehash.average_hash(Image.open(‘twitter_photo.jpeg’)) cutoff = 5 # maximum bits that could be different between the hashes. if hash0 – hash1 < cutoff: print(‘images are similar’) else: print(‘images are not similar’) Since the images are not exactly … Read more
Noo need to reinvent the wheel, there is the Image.thumbnail method available for this: maxsize = (1028, 1028) image.thumbnail(maxsize, PIL.Image.ANTIALIAS) Ensures the resulting size is not bigger than the given bounds while maintains the aspect ratio. Specifying PIL.Image.ANTIALIAS applies a high-quality downsampling filter for better resize result, you probably want that too.
For version 4 you have to call asBitmap() before load() GlideApp.with(itemView.getContext()) .asBitmap() .load(data.getImageUrl()) .into(new SimpleTarget<Bitmap>() { @Override public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {} }); } More info: http://bumptech.github.io/glide/doc/targets.html
AffineTransformOp offers the additional flexibility of choosing the interpolation type. BufferedImage before = getBufferedImage(encoded); int w = before.getWidth(); int h = before.getHeight(); BufferedImage after = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); AffineTransform at = new AffineTransform(); at.scale(2.0, 2.0); AffineTransformOp scaleOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR); after = scaleOp.filter(before, after); The fragment shown illustrates resampling, not cropping; this related … Read more
I have solved this by creating a java-class that you include in your layout-file: public class DynamicImageView extends ImageView { public DynamicImageView(final Context context, final AttributeSet attrs) { super(context, attrs); } @Override protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) { final Drawable d = this.getDrawable(); if (d != null) { // ceil not round … Read more
This should do it. private void resizeImage(string path, string originalFilename, /* note changed names */ int canvasWidth, int canvasHeight, /* new */ int originalWidth, int originalHeight) { Image image = Image.FromFile(path + originalFilename); System.Drawing.Image thumbnail = new Bitmap(canvasWidth, canvasHeight); // changed parm names System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(thumbnail); graphic.InterpolationMode = InterpolationMode.HighQualityBicubic; graphic.SmoothingMode = SmoothingMode.HighQuality; graphic.PixelOffsetMode = … Read more
As rcar says, you can’t without losing some quality, the best you can do in c# is: Bitmap newImage = new Bitmap(newWidth, newHeight); using (Graphics gr = Graphics.FromImage(newImage)) { gr.SmoothingMode = SmoothingMode.HighQuality; gr.InterpolationMode = InterpolationMode.HighQualityBicubic; gr.PixelOffsetMode = PixelOffsetMode.HighQuality; gr.DrawImage(srcImage, new Rectangle(0, 0, newWidth, newHeight)); }
Here’s a nicely commented Image Manipulation helper class that you can look at and use. I wrote it as an example of how to perform certain image manipulation tasks in C#. You’ll be interested in the ResizeImage function that takes a System.Drawing.Image, the width and the height as the arguments. using System; using System.Collections.Generic; using … Read more