CGImage represents a drawable image object in Core Graphics (the low-level procedural drawing API for iOS and Mac OS X).
Questions tagged [cgimage]
563 questions
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Covering a CALayer with a CGImage
I have a CGImage that I want to show in a CALayer. Setting the content and the gravity to the bottom-left works like expected.
layer.contents = cgimage
layer.contentsGravity = .bottomLeft
Now I want center and cover the full layer. Using .center…
tcurdt
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1 answer
Create CGImage from Data multiple times results with previous image override
When generating a CGImage one can choose between an initializer using JPEG-encoded data, PNG-encoded data or just data. I'm generating an image from a Data object containing 16 bit grayscale values.
The initializer required a CGDataProvider which…
Yonatan Vainer
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1 answer
how to speed up the processing of RGB operation in a CGImage struct of macos/swift
I've got my RGB data of the CGImage. but the processing to get avrage color is so slow.
any idea? apreciated.
let screenShot:CGImage = CGDisplayCreateImage(activeDisplays[Int(index)],rect: myrect)!
let dp: UnsafePointer =…
JoJo.Z
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1 answer
iOS: How to get pixel data array from CGImage in Swift
I need to get pixel data as byte array from a CGImage that can be RGB8, RGB16, GRAYSCALE8 or GRAYSCALE16. Previous solutions such as this one produce a dark or distorted image.
georgebp
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3 answers
Unable to compress tiff file in swift
My app has a requirement to capture a snapshot of a paper document using the iPad camera and pass it to a REST API in Tiff Format.
I have tried to capture an image using "UIImagePickerController" and convert it to Tiff format using "kUTTypeTIFF" in…
Boopathi Sakthivel
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1 answer
Release memory when resizeing UIImage in for sentence
I made a method to resize an image. When it resizes an image in images array, it become too much memories(e.g. 200MB~300MB) especially when an image is a High-Quality image(iPhone6/6s). My Project is in ARC. If I want to make it, how do I have to…
masuhara
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Objective c - UIImage resizing issue
I have a resource (.png file) that show a picture frame (border).
This .png file is size 100x100px, and the border width is 10px.
My Question:
How can I create another UIImage from this image, with a different size, without ruin the border's…
Eyal
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1 answer
Using CGImage to generate a low quality JPG from data?
I have some code which loads a jpg from data and displays it in a UIImageView. Because this takes a second, I want to load a lower quality version of the image and display that while the full image is loading. Is this possible?
Andrew
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