Stack Overflow
Stack Overflow

Questions tagged [alphablending]

Alpha blending is a convex combination of a translucent foreground color with a background color allowing for transparency effects.

562 questions
0
votes
0 answers

GLSL fragment shader not handling alpha channel

I am trying to make a few simple gradient fragment shaders for a program. Nothing fancy just specify a start and stop color and interpolate between the two. Everything seem to work fine except for the alpha channel. It seems like unless the color is…
cHorse
  • 11
  • 1
  • 8
0
votes
1 answer

How do you make the background of a texture transparent when it overlaps?

I have a texture that has a black background which I want to make transparent. The problem is that when I draw this texture in front of another object using the texture, the black background still shows. How do I make my texture transparent, even…
Brent
  • 101
  • 1
  • 1
  • 3
0
votes
1 answer

Depth test with two transparent images causes strange artifacts

I am rendering a bush composed of two same images crossed as you can see on the image underneath : But when we turn around the bush, on of the two images has visibly big problems with it's depth test : I tried disabling the depth test but it was…
Louis de Bussac
  • 27
  • 11
0
votes
0 answers

HLSL alphablending in geometry shader

I am rather new to HLSL and I am struggling with implementing a grass shader. In the geometry shader I create quads which will display the grass blades. However when I try blending in the pixelshader things get weird. Sometimes it ignores everything…
Quinten Henry
  • 125
  • 1
  • 2
  • 10
0
votes
1 answer

Java Equivalent OpenCV Code to this C++ Code

Can anybody tell me the correct java code for this c++ code snippet: output.at(x, y) = target.at(dx, dy); I have tried this java code and they are displacing pixel but not showing image clearly : output.put(x, y, target.get(dx, dy));
Udaib Khan
  • 1
  • 7
0
votes
2 answers

Prevent a unit to be automatically added to the Uses clause?

I am using TJvTransparentForm (from Project JEDI) on one of my forms. I am also using AlphaControls for my entire project. The problem is, TJvTransparentForm does not work well with the unit "acPNG" from AlphaControls. I need to use the regular PNG…
Jeff
  • 12,085
  • 12
  • 82
  • 152
0
votes
1 answer

Blending several fragment shaders in THREE.js to obtain one THREE.ShaderMaterial

I have a question about blending several fragment shaders in THREE.js Here I present a code for mixing one shader with different parameters, but I also need to mix different shaders. My shader: uniform vec3 color; varying vec2 vUv; void main()…
zlon
  • 812
  • 8
  • 24
0
votes
2 answers

Blend alpha color using bitwise operations

I have code below to blend alpha color in ARGB format: a, b, o are integers, but should always fall in [0x00ffffff,0xffffffff] o = ( ( ( a >> 24 ) * ( b >> 24 ) ) >> 8 ) << 24; Is there anyway to optimize it? Thanks!
echo
  • 789
  • 2
  • 12
  • 21
0
votes
1 answer

With Metal (vs OpenGL), How does color/alpha blending work on single-channel render targets?

I'm porting some OpenGL code from a technical paper to use with Metal. In it, they use a render target with only one channel - a 16-bit float buffer. But then they set blending operations on it like this: glBlendFunci(1, GL_ZERO,…
bsabiston
  • 721
  • 6
  • 22
0
votes
0 answers

overlapping alpha blending on spans

I'm right now trying to create a web page that has some text appearing over some images. I have a few elements that have a background with an alpha channel. I'm having an issue when the the goes multi-line. I'd like for the…
Benjamin
  • 1,223
  • 1
  • 13
  • 22
0
votes
0 answers

2-D alpha map examples for blending two overlayed images in MATLAB

I would like to blend two images, one is smaller and is completely enclosed by the larger one, Assume the both are rectangular. I would like to blend these two so that there is a smooth transition in a rectangular band around the smaller image. I am…
TJ1
  • 7,578
  • 19
  • 76
  • 119
0
votes
1 answer

Should the Output RGB be Divided by Output Alpha in the Non-premultiplied Alpha Blending Equation?

In alpha compositing wiki, I see the blending equation is like this (no pre-multiplying): But in this slides, the equation is like this: In the first equation, outRGB is divided by outAlpha. What does it mean? Which one is the correct equation?
K.Miao
  • 811
  • 7
  • 21
0
votes
0 answers

Subtracting a mat from scalar value

Im trying to do alpha blending as in learnopencv //Load the bitmap foregroundBitmap = BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.dominant); backgroundBitmap =…
user3600801
0
votes
1 answer

How can I increase the size of my Alpha mask in Python / PyGame?

I am creating a 2D dungeon crawler using Pygame, and I want to use the main character as a light source (so you can only see a small amount of the dungeon around you). I have created an alpha mask, but no matter how big I make my alpha mask, it…
Jayce
  • 539
  • 6
  • 21
0
votes
0 answers

Blending white colors in images

I need to modify any image to get these results: White color has to be the color I specify, I don't want to keep source image's lightness. Rest of colors have to be tinted similar to Photoshop's "Color" layer blend mode. That is, I need them to…
AppsDev
  • 12,319
  • 23
  • 93
  • 186
1 2 3
…
37 38