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Questions tagged [pixel-graphics]

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19 votes
2 answers
17k views

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 ...
Anarach's user avatar
  • 293
14 votes
2 answers
9k views

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 ...
Mark's user avatar
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9 votes
3 answers
2k views

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?
V0ight's user avatar
  • 91
8 votes
1 answer
3k views

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 ...
IS4's user avatar
  • 183
6 votes
2 answers
2k views

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 ...
FLUSHER's user avatar
  • 161
6 votes
1 answer
544 views

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. ...
Belphegor's user avatar
  • 163
5 votes
2 answers
108 views

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 ...
4673_j's user avatar
  • 151
5 votes
1 answer
2k views

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. ...
Sander Schaeffer's user avatar
4 votes
1 answer
105 views

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.
The_Coder's user avatar
  • 143
3 votes
1 answer
79 views

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 ...
sajis997's user avatar
  • 1,279
3 votes
1 answer
151 views

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 ...
angel_30's user avatar
  • 229
3 votes
1 answer
148 views

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 ...
uhoh's user avatar
  • 330
2 votes
3 answers
757 views

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?
AC007's user avatar
  • 23
2 votes
2 answers
489 views

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 ...
Aryan Sethi's user avatar
2 votes
1 answer
2k views

Thick Line segment

How is this 'wy' equation for thick line segment derived?
jeet rabari's user avatar
2 votes
1 answer
77 views

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 ...
Colin's user avatar
  • 121
2 votes
0 answers
150 views

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 ...
Raph Schim's user avatar
1 vote
1 answer
395 views

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 ...
Magmatic's user avatar
  • 111
1 vote
1 answer
138 views

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, ...
skeetastax's user avatar
1 vote
1 answer
807 views

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(...
koperandus's user avatar
1 vote
1 answer
1k views

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 ...
videogamechef's user avatar
1 vote
2 answers
860 views

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 ...
kmdhrm's user avatar
  • 111
1 vote
1 answer
132 views

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 ...
Nubcodes's user avatar
1 vote
1 answer
3k views

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 ...
hezided's user avatar
  • 11
1 vote
1 answer
101 views

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 ...
PolymorphismPrince's user avatar
1 vote
1 answer
2k views

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 ...
JSmith's user avatar
  • 183
1 vote
0 answers
31 views

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 ...
Urooj's user avatar
  • 111
1 vote
0 answers
313 views

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 ...
JSmith's user avatar
  • 183
0 votes
2 answers
116 views

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 ...
rustyBucketBay's user avatar
0 votes
1 answer
256 views

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): ...
sumsar8's user avatar
0 votes
1 answer
16 views

Clarification on PPI

I wanted to convert a chart rendered by canvas element to an image file so that the user can download it. But the official HTML docs say that: The created image data will have a resolution of 96dpi ...
Urooj's user avatar
  • 111
0 votes
0 answers
33 views

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 ...
Ehsan's user avatar
  • 1
0 votes
0 answers
29 views

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 ...
talC's user avatar
  • 1
0 votes
0 answers
1k views

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.
ataush's user avatar
  • 1
0 votes
0 answers
491 views

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 ...
Mohamed Sharbudeen's user avatar
-1 votes
1 answer
42 views

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?
QuestionAboutGraphics's user avatar