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Questions tagged [pixel]

A pixel is the smallest unit that can be represented or controlled on a display. The word pixel is derived from the phrase "picture element".

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Fastest way to draw 1024x1024 dots on screen

I am developing a program that must calculate a color of each point on a 1024x1024 picture using a special algorithm. The color of a point represents some value. So each point is independent of other points and must be drawn separately. I do not…
pavelkolodin
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android fast pixel access and manipulation

I'm trying to port an emulator that i have written in java to android. Things have been going nicely, I was able to port most of my codes with minor changes however due to how emulation works, I need to render image at pixel level. As for desktop…
afro100
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How to convert DLU into pixels?

Microsoft uses dialog length units (DLU) in their guidelines for UI. How can I convert them into pixels? As I know, DLU depending on system font size. Can you advise some simple method of such conversion in Delphi for Win32?
Andrew
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OpenGL/PBO pixel drawing example needed

I need to draw pixels very fast on a screen. I found this interesting page Fast pixel drawing library author posted: "Using an OpenGL texture along with a PBO seems to be the best choice. Thanks." I guess OpenGL/PBO is what i need. I was reading…
Stan
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Android color splash

Can someone suggest me a fast method or a library for color splash effect? For example, I select a color and a photo gets desaturated for all colors except that one I have picked. I have tried using pixel by pixel color check and then replace the…
filipst
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GetDIBits and loop through pixels using X, Y

I'm grabbing a portion of the screen and scanning through the pixels for a certain color range. I looked at MSDN's Capturing an Image example and know how to use the functions. I can get the bits into an array, but I'm not sure how to do it in such…
guitar-
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Is there a formula to determine overall color given BGR values? (OpenCV and C++)

I am making a function using C++ and OpenCV that will detect the color of a pixel in an image, determine what color range it is in, and replace it with a generic color. For example, green could range from dark green to light green, the program would…
Wyndrix
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Auto Layout vs Frame Sizes

So I'm slightly embarrassed to ask this because it seems so rudimentary but ever since beginning iOS development (about a year of self/internet teaching), when not using storyboards, I have relied heavily on frame sizes and used auto layout very…
Matt Clevenger
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Is it wise to use fractional / decimal pixels for borders in css?

I have various instances in my design that call for border-right: 1.5px solid black; border-bottom: 1.5px solid black; etc... I also have design that needs thinner lines: at 1px. However, it seems the browser may round the decimal, as I'm not…
someoneHere
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Finding closest non-black pixel in an image fast

I have a 2D image randomly and sparsely scattered with pixels. given a point on the image, I need to find the distance to the closest pixel that is not in the background color (black). What is the fastest way to do this? The only method I could…
shoosh
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Why do rendered pixels differ from real pixels?

In my HTML i have a
(call it the panel) with fixed width that contains some text; that text is set to font-size: 25px; line-height: 25px; in the accompanying CSS. It so happens that the text ends up as 36 lines. Given that all margins,…
flow
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How to draw Pixel Perfectly on iPhone 6 Plus?

Given the iPhone 6 Plus is downscaling from 1242x2208 to 1080x1920, and UIKit is doing that, are there other ways of drawing to the screen that permit absolute (pixel perfect) drawing without downscaling? I imagine, but am not sure, that OpenGL and…
Confused
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How do I load and edit a bitmap file at the pixel level in Swift for iOS?

I want to manipulate an image at the pixel level in Swift. This question was answered for objective c: How do I access and manipulate JPEG image pixels?, but I would like to see the equivalent source for Swift.
Fred Hamilton
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Edit raw pixel data of WriteableBitmap?

Is it possible to directly read/write to a WriteableBitmap's pixel data? I'm currently using WriteableBitmapEx's SetPixel() but it's slow and I want to access the pixels directly without any overhead. I haven't used HTML5's canvas in a while, but…
Oztaco
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How to measure the pixel width of a digit in a given font / size (C#)

I am trying to calculate the pixel width of Excel columns, as described in this post, using the official formula from the OpenXML specification. However, in order to apply this formula, I need to know the Maximum Digit Width of the Normal font,…
Tim Coulter
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