alpha Questions
6
Solved
I have a 3 column matrix; plots are made by points based on column 1 and column 2 values, but colored based on column 2 (6 different groups). I can successfully plot all points, however, the last p...
7
Solved
Scenario
I would like to save images with alpha transparency as .png and images without alpha transparency as .jpg (even if their original format is .png or .gif). How can I detect whether or not a...
Dominicadominical asked 5/4, 2010 at 22:5
4
Is it possible to select transparent colors using built in
<input type="color">
I haven't found a slider that does that. Is there some option additional I need to check?
2
I am trying to convert a .mov file with alpha transparency into a .webm file and have been following this thread for help: Convert mov with Alpha to VP9 Webm with Alpha Using ffmpeg
The command li...
4
Solved
I want to do a very simple alpha animation but I cannot find a valid way.
The idea is to perform this animation over a view:
alpha from 0 to 1 of 1 second
hold alpha at 1 for 5 seconds
alpha fro...
4
Solved
I am plotting a histogram, and I have three datasets which I want to plot together, each one with different colours and linetype (dashed, dotted, etc).
I am also giving some transparency, in order ...
Byron asked 8/2, 2015 at 19:14
12
Solved
Using the HTML5 <canvas> element, I would like to load an image file (PNG, JPEG, etc.), draw it to the canvas completely transparently, and then fade it in. I have figured out how to load the...
Graze asked 1/3, 2010 at 22:22
2
Solved
I'm trying to combine alpha and fill aesthetics. It works when I'm using geom_bar (or geom_points, for color), but the alpha legend doesn't work in when I'm using geom_boxplot.
library(data.table)
...
2
Solved
I'm encoding ProRes 4444 with alpha channel video's to transparent video for web in both VP9 (webm) and HEVC (mp4). I'm using a great free tool by Rotato to encode to both formats at once.
However,...
2
I have two colors, c₀ and c₁. They have variable alpha, red, green and blue values: (a₀, r₀, b₀, g₀) and (a₁, r₁, b₁, g₁). I'm wondering if there is a simple formula for combining these colors to o...
Initial asked 6/3, 2015 at 14:12
3
Like the title says, i would like to somehow add transparency to a hex color defined in css variable. I have seen solutions in other posts using rgb, but I need hex.
Maybe with rgba(), calc() or li...
8
I'm using PIL (Python Imaging Library). I'd like to draw transparent polygons. It seems that specifying a fill color that includes alpha level does not work. Are their workarounds?
If it can't be ...
Louielouis asked 11/12, 2008 at 15:26
11
Solved
I have an app icon for iOS but Apple doesn't allow alpha to be in the image. How to remove this alpha channel? I only have the png image with me I don't have the source file as my friend did the im...
7
Solved
I'm using windows forms in C# and I need to make a textbox's background color transparent. I have a trackbar that goes from 0 to 255 that is supposed to control it, but I'm having some trouble. I c...
Wandering asked 17/4, 2013 at 2:9
6
Is there any way to make an image half transparent?
the pseudo code is something like this:
from PIL import Image
image = Image.open('image.png')
image = alpha(image, 0.5)
I googled it for a co...
Whipstock asked 14/7, 2014 at 6:55
2
Solved
In my Django application, uploaded video files are transcoded into some particular format using ffmpeg.
I now need a way to reliably detect whether uploaded videos have alpha channel or not. ...
Maskanonge asked 2/9, 2021 at 11:31
1
Inspired by this question, I realized I haven't been able to find a clear answer to what the bit depth of the a part of rgba and hsla in CSS3 colors actually is. I've hunted through various W3C doc...
3
Solved
I have some PNG images which consist of a black shape and a transparent background.
Unfortunately, IrfanView shows transparent background as black color, so I see just black on black. I've found in...
Termor asked 18/2, 2013 at 15:40
11
Solved
The following PHP code snippet uses GD to resize a browser-uploaded PNG to 128x128. It works great, except that the transparent areas in the original image are being replaced with a solid color- bl...
Underlinen asked 28/8, 2008 at 13:23
2
Solved
Is there a way to plot transparent data points when using palette?
I currently have the following code:
set style fill transparent solid 0.2 noborder
set palette rgb 22,13,-22
plot 'mydata.dat' u...
Damron asked 16/2, 2020 at 17:2
4
Solved
I have a large amount of images with a black background, here is one for example:
Is it possible through Javascript to have to ignore the black (#000000) and have it draw on canvas? to appear li...
Obala asked 26/2, 2016 at 3:57
3
Solved
Suppose I have a video foo.mkv and an image bar.png (which happens to contains an alpha channel). I can blend this image over the video like this:
ffmpeg
-i foo.mkv
-i bar.png
-filter_comple...
Inquisitive asked 3/8, 2016 at 21:13
2
Solved
I have a Metal fragment shader that returns some transparent colors with an alpha channel and I'd like to reveal a UIView under the MTKView, but they only background result I get is black and "erro...
7
Solved
Is it possible to set a transparency or alpha level on SVG fill colours?
I've tried adding two values to the fill tag (changing it from fill="#044B94" to fill="#044B9466"), but this doesn't work.
...
Chenopod asked 18/5, 2011 at 9:29
10
Solved
Is there really no XML attribute counterpart to setAlpha(int)?
If not, what alternatives are there?
Premiere asked 8/2, 2011 at 8:46
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