Questions tagged [pixel-graphics]
The pixel-graphics tag has no usage guidance.
35
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How do I normalize all pixel values such that all pixel values are 'pulled towards' the mean?
Originally asked in Graphic Design site here (but I don't know how to 'move' a question to another site)
Credit to this guy: Python Tutorials for Digital Humanities - I followed a lot of his ideas, ...
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undefined reference to `SDL_setRenderDrawColor'
I am getting
C:\Users\rasmu\AppData\Local\Temp\ccwOn3mM.o:main.c:(.text+0x11f): undefined reference to `SDL_setRenderDrawColor'
C:\Users\rasmu\AppData\Local\Temp\ccwOn3mM.o:main.c:(.text+0x155): ...
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What happens when we select lower resolutions on a high-resolution monitor?
I have a monitor with a resolution of 1360x768 (16:9), When I set the resolution to 1280x768 (5:3), 1024x768 (4:3), 800x600 (4:3), even 1920x1080 (16:9) it completely covers the screen and the monitor ...
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2
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Purpose and workflow of wireframe models
I am more less familiarized with the major computer graphics concepts up to certain dregree of "low-levelness". So I know how models, vertices, polygons etc. and how these works. Also how is ...
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Why does a game at 1080p look better on a 1080p display than 1440p display of the same size
So this is something i recently noticed.
I have a 27inch 1440p monitor. And a game in 1080p looks pixelated on that.
My friend has a 27 inch 1080p monitor and the same game on 1080p with all same ...
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119
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wall clock using bresenhams circle drawing algo
I am new to CG and I need to draw a wall clock using bresenhams circle algo . I have drawn a circle using this algo but how do I add minute and hour needle in it basically how do i add lines inside a ...
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388
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Why do some videos look smoother and others don't on the same monitor
I have a Dell monitor with 60 Hz refresh rate and therefore games playing on it are not very smooth as compared to 120 hz.
But when I open videos on YouTube of the same game on the same monitor, some ...
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Why refresh rate is needed in a passive-matrix LCD?
In a passive-matrix LCD we have horizontal and vertical conductors. The intersection points are pixels which are cells of liquid crystal molecules . For drawing a frame, we provide the necessary ...
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350
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Algorithm for thinning a thick line
I'm trying to reduce a thick line, in raster space, down to a thin line, preferably one pixel wide (or thick).
Does anybody know of an algorithm that can do this?
Imagine you draw with a marker on a ...
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What APIs are used to output video and audio from a custom codec?
I am looking for tools to generate video and audio output for my own codecs, in my search I found SDL, EGL, FFmpeg and OpenAL, but it is not clear to me if these APIs serve my purpose which is simply ...
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Is it possible to draw horizontal and vertical line with Bresenham's line drawing algorithm?
In computer graphics Bresenham's line drawing algorithm used to draw line . But i want to know the properties why i can't draw vertical and horizontal line by this algorithm.
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448
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Sub pixel rendered white text on black background changes color when resized to a very small size
download: https://upload.wikimedia.org/wikipedia/commons/5/57/Subpixel-rendering-RGB.png
The above picture is an example for sub pixel rendering. I tried resizing the image to very small size in ...
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Convert RGB image to YUV420 using a hlsl shader
I am new to shaders and I need to convert efficiently an RGB image to YUV420.
I can convert the RGB image to YUV420 with a simple c++ program that uses the
...
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Confused about graphic art and what software is used to create the environment of it? [closed]
I have a question that I am stuck on, I am wondering what style is this image considered? And what program do people generally use to create this?
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How to raytrace triangular faces when camera is not at origin?
I've watched the Pixar In A Box, Maths of Rendering Tutorial on Khan Academy. I've started writing a raytracing program and have come to the point where I must solve for ...
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Difference in pixels between different monitors' sizes
If I have an image of x/y resolution and display it on a monitor, does this mean that between a 15-inch monitor and a 42-inch, the same amount of pixels (x/y) will be displayed, only that each pixel ...
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Bresenham's Algorithm not drawing horizontal lines
I'm getting started with graphics and I'm having trouble implementing the Bresenham's algorithm. Now, I know that my implementation is incomplente, but I can't see why it doesn't make horizontal lines(...
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277
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How can I convert a shape made out of pixels to vertices
I'm trying to implement the solution to get the minimum dissection into rectangles of a rectilinear polygon.
My shape is made out of pseudo-pixels (different width/height) but for the moment let's ...
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How can I draw a filled circle on a grid with the less rectangle as possible?
I have a grid with a variable width/height spacing. Let's say 100 horizontal lines separated by 80 pixels and 100 hundred vertical lines separated by 50 pixels.
Each cell of the grid in my logic have ...
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697
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How does the Painter's Algorithm handle transparency?
I was wondering if anyone could explain how the Painter's algorithm would handle transparent objects? Can the Painter's algorithm handle transparency?
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146
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What is this technique called and how can I reproduce it algorithmically?
I don't know the name of this technique, but the idea is to adjust the density and location of identical dots or small objects in order to produce a gray tone image or even a suggestion of three ...
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Calculate set of rectangles covering pixel diffs?
I'd like to develop a system for web animation similar to animated gifs, like this one. I capture a series of screenshots at fixed time intervals, and then I'd like to animate them. I can trivially ...
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3
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151
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human visual: relation of Distance and DPI
I was told that human's visual sharpness is 60 pixels per degree. As such, pixel per inch is approximately given by:
PPI = 1/ (Distance * tg((1/60*pi/180) )
Is ...
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147
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Image Laplacian incomprehension
I am reading and trying to implement a research paper.
It uses openGL to define which part of an image to use in order to reconstitute a big image composited of several images.
In order to do so, I ...
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Which technique is fast to generate real-time reflections?
I want to know about some technique with which i can generate nice reflections on the surface. I know one conventional technique where we invert an object and render it and blend it with the floor but ...
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515
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Anti-aliasing - Controlling colour density of pixel that comes within the "rectangle" surrounding my line
I am currently a beginner when it comes to anti-aliasing. I have read some notes online that how anti-aliasing works is that you first draw the line using an algorithm such as Bresenham's algorithm. ...
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104
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Get screen size and then resize image accordingly
I'm a programmer working in Java and I'm not sure if this is the right place to ask this kind of question, here it goes:
In my program, I need to show an image (.jpeg .png etc.) based on the screen ...
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Do GPU performance improve when rendering at native or half resolution, compared to fixed scaling?
This might be an odd question, but I was wondering if you could improve GPU performance with games, comparatively, when using doubles/halves of the native resolution, instead of an odd ratio of that.
...
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Why does checkerboard pattern on a computer screen appear with a yellowish tint?
This question was originally asked on Physics, then moved to Cognitive Sciences.
Consider the following image:
You might want to display the image in a new page, in case it gets resized for mobile ...
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101
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library / tool for implementing algorithms
I'm new to graphics and want to implement algorithms like dda,scan-line, clipping,etc. I'm confused which library to use. OpenGl, graphics in turbo c,or any other. Please suggest.
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vertical or horizontal line test
I have a line segment defined by two coordinate values and I need to check if the line segment is parallel to the x-axis or y-axis. I believe that it is not that difficult to find. When it comes to ...
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What is Tessellation in computer graphics
In recent games I have noticed something called Tessellation, Turning the thing ON destroys my frame rate.
I have noticed that it when turned on it looks like Anti - Aliasing.
Can someone give me ...
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How does a computer upscale 1024x768 resolution to 1920x1080?
Without there being black bars I mean. 1080 isn't any multiple of 768 so is there some sort of data loss?
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Fast antialiased line drawing
Bresenham's line algorithm is a way of drawing straight lines using only fast integer operations (addition, subtraction, and multiplication by 2). However, it generates aliased lines. Is there a ...
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