I am trying to resize a NSImage implementing a code that I got from this website https://gist.github.com/eiskalteschatten/dac3190fce5d38fdd3c944b45a4ca469, but it's not working.
Here is the code:
static func redimensionaNSImage(imagem: NSImage, tamanho: NSSize) -> NSImage {
var imagemRect: CGRect = CGRect(x: 0, y: 0, width: imagem.size.width, height: imagem.size.height)
let imagemRef = imagem.cgImage(forProposedRect: &imagemRect, context: nil, hints: nil)
return NSImage(cgImage: imagemRef!, size: tamanho)
}
I forgot to calculate the ratio. Now it's working fine.
static func redimensionaNSImage(imagem: NSImage, tamanho: NSSize) -> NSImage {
var ratio:Float = 0.0
let imageWidth = Float(imagem.size.width)
let imageHeight = Float(imagem.size.height)
let maxWidth = Float(tamanho.width)
let maxHeight = Float(tamanho.height)
// Get ratio (landscape or portrait)
if (imageWidth > imageHeight) {
// Landscape
ratio = maxWidth / imageWidth;
}
else {
// Portrait
ratio = maxHeight / imageHeight;
}
// Calculate new size based on the ratio
let newWidth = imageWidth * ratio
let newHeight = imageHeight * ratio
// Create a new NSSize object with the newly calculated size
let newSize:NSSize = NSSize(width: Int(newWidth), height: Int(newHeight))
// Cast the NSImage to a CGImage
var imageRect:CGRect = CGRect(x: 0, y: 0, width: imagem.size.width, height: imagem.size.height)
let imageRef = imagem.cgImage(forProposedRect: &imageRect, context: nil, hints: nil)
// Create NSImage from the CGImage using the new size
let imageWithNewSize = NSImage(cgImage: imageRef!, size: newSize)
// Return the new image
return imageWithNewSize
}
Related
I'm taking snapshot from a PDFView in PDFKit for streaming (20 times per sec), and I use this extesnsion
extension UIView {
func asImageBackground(viewLayer: CALayer, viewBounds: CGRect) -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: viewBounds)
return renderer.image { rendererContext in
viewLayer.render(in: rendererContext.cgContext)
}
}
}
But the output UIImage from this extension has a high resolution which make it difficult to stream. I can reduce it by this extension
extension UIImage {
func resize(_ max_size: CGFloat) -> UIImage {
// adjust for device pixel density
let max_size_pixels = max_size / UIScreen.main.scale
// work out aspect ratio
let aspectRatio = size.width/size.height
// variables for storing calculated data
var width: CGFloat
var height: CGFloat
var newImage: UIImage
if aspectRatio > 1 {
// landscape
width = max_size_pixels
height = max_size_pixels / aspectRatio
} else {
// portrait
height = max_size_pixels
width = max_size_pixels * aspectRatio
}
// create an image renderer of the correct size
let renderer = UIGraphicsImageRenderer(size: CGSize(width: width, height: height), format: UIGraphicsImageRendererFormat.default())
// render the image
newImage = renderer.image {
(context) in
self.draw(in: CGRect(x: 0, y: 0, width: width, height: height))
}
// return the image
return newImage
}
}
but it add an additional workload which make the process even worse. Is there any better way?
Thanks
You can downsample it using ImageIO which is recommended by Apple:
extension UIImage {
func downsample(to resolution: CGSize) -> UIImage? {
let imageSourceOptions = [kCGImageSourceShouldCache: false] as CFDictionary
guard let data = self.jpegData(compressionQuality: 0.75) as? CFData, let imageSource = CGImageSourceCreateWithData(data, imageSourceOptions) else {
return nil
}
let maxDimensionInPixels = Swift.max(resolution.width, resolution.height) * 3
let downsampleOptions = [
kCGImageSourceCreateThumbnailFromImageAlways: true,
kCGImageSourceShouldCacheImmediately: true,
kCGImageSourceCreateThumbnailWithTransform: true,
kCGImageSourceThumbnailMaxPixelSize: maxDimensionInPixels
] as CFDictionary
guard let downsampledImage = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, downsampleOptions) else {
return nil
}
return UIImage(cgImage: downsampledImage)
}
}
I have an UIImageView with contentMode = .aspectFit. I have an image in imageView, which dimension is bigger than size of imageView. User can draw some lines and save them as sublayer. After that I need to save the edited image. But quality of saved image is worse than quality of image which I load.
What am I doing wrong? I tried to use transform, but it didn't work.
import UIKit
extension UIImageView {
var contentClippingRect: CGRect {
let imgViewSize = self.frame.size
let imgSize = self.image?.size ?? .zero
let scaleW = imgViewSize.width / imgSize.width
let scaleH = imgViewSize.height / imgSize.height
let aspect = fmin(scaleW, scaleH)
let width = imgSize.width * aspect
let height = imgSize.height * aspect
let imageRect = CGRect(x: (imgViewSize.width-width)/2 + self.frame.origin.x, y: (imgViewSize.height-height)/2 + self.frame.origin.y, width: width, height: height)
return imageRect
}
func asImage() -> UIImage {
let imageRect = self.contentClippingRect
let renderer = UIGraphicsImageRenderer(bounds: imageRect)
let renderedImage = renderer.image { rendererContext in
layer.render(in: rendererContext.cgContext)
}
return renderedImage
}
}
You can use UIGraphicsImageRendererFormat().scale it will increase quality of the rendered image a bit.
import UIKit
extension UIImageView {
var contentClippingRect: CGRect {
let imgViewSize = self.frame.size
let imgSize = self.image?.size ?? .zero
let scaleW = imgViewSize.width / imgSize.width
let scaleH = imgViewSize.height / imgSize.height
let aspect = fmin(scaleW, scaleH)
let width = imgSize.width * aspect
let height = imgSize.height * aspect
let imageRect = CGRect(x: (imgViewSize.width-width)/2 + self.frame.origin.x, y: (imgViewSize.height-height)/2 + self.frame.origin.y, width: width, height: height)
return imageRect
}
func asImage() -> UIImage {
let imageRect = self.contentClippingRect
//add this
let format = UIGraphicsImageRendererFormat()
format.scale = 2
let renderer = UIGraphicsImageRenderer(bounds: imageRect, format: format)
let renderedImage = renderer.image { rendererContext in
layer.render(in: rendererContext.cgContext)
}
return renderedImage
}
}
I have large images uploaded by users in Swift and I need to resize them all to 100x100px to create thumbnails to store in my server. So far I have found that this resizes an image given a CGSize:
func resizedImage(image: UIImage, size: CGSize) -> UIImage? {
let renderer = UIGraphicsImageRenderer(size: size)
return renderer.image { (context) in
image.draw(in: CGRect(origin: .zero, size: size))
}
}
Is there any way to create a CGSize knowing that my target size is strictly 100x100px?
Got this to work:
extension UIImage {
func resizedImage(pixelSize: (width: Int, height: Int)) -> UIImage? {
var size = CGSize(width: CGFloat(pixelSize.width) / UIScreen.main.scale, height: CGFloat(pixelSize.height) / UIScreen.main.scale)
let rect = AVMakeRect(aspectRatio: self.size, insideRect: CGRect(x:0, y:0, width: size.width, height: size.height))
let renderer = UIGraphicsImageRenderer(size: size)
return renderer.image { (context) in
self.draw(in: rect)
}
}
}
You should initialize your render based on the user device scale and multiply its width and height instead of dividing it:
extension UIImage {
func aspectFitScaled(to size: CGSize) -> UIImage {
let format = imageRendererFormat
format.opaque = false
format.scale = UIScreen.main.scale
let isLandscape = self.size.width > self.size.height
let ratio = isLandscape ? size.width / self.size.width : size.height / self.size.height
let drawSize = self.size.scaled(by: ratio)
let x = (size.width - drawSize.width) / 2
let y = (size.height - drawSize.height) / 2
let origin = CGPoint(x: x, y: y)
return UIGraphicsImageRenderer(size: size, format: format).image { _ in
draw(in: CGRect(origin: origin, size: drawSize))
}
}
}
usage:
class ViewController: UIViewController {
// imageView frame is 200 x 200
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// original image size is (719.0, 808.0)
let image = UIImage(data: try! Data(contentsOf: URL(string: "https://i.stack.imgur.com/Xs4RX.jpg")!))!
imageView.backgroundColor = .gray
let ivImage = image.aspectFitScaled(to: imageView.frame.size)
imageView.image = ivImage
print("ivImage.size", ivImage.size) // (200.0, 200.0)
print("ivImage.scale", ivImage.scale) // screen scale 3.0 iPhone 8 Plus
// lets check the real image dimension
let data = ivImage.jpegData(compressionQuality: 1)!
let savedSize = UIImage(data: data)!.size
print("savedSize", savedSize) // savedSize (600.0, 600.0)
}
}
I'm using the following code to resize an image.But i keep getting a white border at the bottom
func resize(withSize targetSize: NSSize) -> NSImage? {
let size=NSSize(width: floor((targetSize.width/(NSScreen.main?.backingScaleFactor)!)), height:floor( (targetSize.height/(NSScreen.main?.backingScaleFactor)!)))
let frame = NSRect(x: 0, y: 0, width: floor(size.width), height: floor(size.height))
guard let representation = self.bestRepresentation(for: frame, context: nil,hints: nil) else {
return nil
}
let image = NSImage(size: size, flipped: false, drawingHandler: { (_) -> Bool in
return representation.draw(in: frame)
})
return image
}
I have tried using floor function to round off the values.But still the same issue.
extension NSImage {
func resize(withSize targetSize: NSSize) -> NSImage? {
let ratioX = targetSize.width / size.width / (NSScreen.main?.backingScaleFactor ?? 1)
let ratioY = targetSize.height / size.height / (NSScreen.main?.backingScaleFactor ?? 1)
let ratio = ratioX < ratioY ? ratioX : ratioY
let canvasSize = NSSize(width: size.width * ratio, height: size.height * ratio)
let frame = NSRect(origin: .zero, size: canvasSize)
guard let representation = bestRepresentation(for: frame, context: nil, hints: nil)
else { return nil }
return NSImage(size: canvasSize, flipped: false) { _ in representation.draw(in: frame) }
}
}
let image = NSImage(contentsOf: URL(string: "http://i.stack.imgur.com/Xs4RX.jpg")!)!
let resized = image.resize(withSize: .init(width: 400, height: 300)) // w 267 h 300
If you would like to take into account the screen scale just remove the division by (NSScreen.main?.backingScaleFactor ?? 1) from the method when calculating ratioX and ratioY
I am trying to resize a NSImage to use it with parse as a PFFile and I need to change its dimension to reduce its data size it but it is not working. The resized image resizes the width and height inside Swift but it keeps the same dimensions from the original image.
The image is a JPG with 2560 x 1706 and 721 KB.
When I pass it to data it keeps the same dimensions and gos to 5.7 MB
Here is my code:
let fotoNSImage = NSImage(byReferencing: url)
let fotoNSImageRedim = redimensionaNSImage(imagem: fotoNSImage, tamanho: NSSize(width: 200, height: 200))
let fotoNSImageRep = NSBitmapImageRep(data: (fotoNSImageRedim.tiffRepresentation)!)
let fotoNSImagePng = fotoNSImageRep!.representation(using: NSBitmapImageRep.FileType.png, properties: [:])
let fotoProduto = FotoProduto(foto: PFFile(data: fotoNSImagePng!)!, categorias: [])
The method to resize de image:
static func redimensionaNSImage(imagem: NSImage, tamanho: NSSize) -> NSImage {
var ratio: Float = 0.0
let imageWidth = Float(imagem.size.width)
let imageHeight = Float(imagem.size.height)
let maxWidth = Float(tamanho.width)
let maxHeight = Float(tamanho.height)
if (imageWidth > imageHeight) {
// Landscape
ratio = maxWidth / imageWidth;
}
else {
// Portrait
ratio = maxHeight / imageHeight;
}
// Calculate new size based on the ratio
let newWidth = imageWidth * ratio
let newHeight = imageHeight * ratio
// Create a new NSSize object with the newly calculated size
let newSize: NSSize = NSSize(width: Int(newWidth), height: Int(newHeight))
// Cast the NSImage to a CGImage
var imageRect: CGRect = CGRect(x: 0, y: 0, width: Int(newWidth), height: Int(newHeight))
let imageRef = imagem.cgImage(forProposedRect: &imageRect, context: nil, hints: nil)
// Create NSImage from the CGImage using the new size
let imageWithNewSize = NSImage(cgImage: imageRef!, size: newSize)
// Return the new image
return imageWithNewSize
}
I have already tried the following approaches without success.
1 - Change the pixelWide and pixelHigh directly on fotoNSImagePng:
fotoNSImageRep?.pixelsWide = 200
fotoNSImageRep?.pixelsHigh = 133
2 - Creating a new NSBitmapImageRep and replace the image representation with it:
let rep = NSBitmapImageRep(bitmapDataPlanes: nil,
pixelsWide: 200,
pixelsHigh: 133,
bitsPerSample: 8,
samplesPerPixel: 4,
hasAlpha: true,
isPlanar: false,
colorSpaceName: NSDeviceRGBColorSpace,
bytesPerRow: Int(newSize.width * 4),
bitsPerPixel: 32)
3 - Follow this approach:
How to resize - resample - change file size - NSImage
4 - Change the NSBitmapImageRep size values:
fotoNSImageRep?.size.width = 200
fotoNSImageRep?.size.height = 133
Nothing has worked so far.
I have modified the method that resizes the image
static func redimensionaNSImage(imagem: NSImage, tamanho: NSSize) -> NSImage {
var ratio: Float = 0.0
let imageWidth = Float(imagem.size.width)
let imageHeight = Float(imagem.size.height)
let maxWidth = Float(tamanho.width)
let maxHeight = Float(tamanho.height)
// Get ratio (landscape or portrait)
if (imageWidth > imageHeight) {
// Landscape
ratio = maxWidth / imageWidth;
}
else {
// Portrait
ratio = maxHeight / imageHeight;
}
// Calculate new size based on the ratio
let newWidth = imageWidth * ratio
let newHeight = imageHeight * ratio
let imageSo = CGImageSourceCreateWithData(imagem.tiffRepresentation! as CFData, nil)
let options: [NSString: NSObject] = [
kCGImageSourceThumbnailMaxPixelSize: max(imageWidth, imageHeight) * ratio as NSObject,
kCGImageSourceCreateThumbnailFromImageAlways: true as NSObject
]
let size1 = NSSize(width: Int(newWidth), height: Int(newHeight))
let scaledImage = CGImageSourceCreateThumbnailAtIndex(imageSo!, 0, options as CFDictionary).flatMap {
NSImage(cgImage: $0, size: size1)
}
return scaledImage!
}