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2
votes
1answer
34 views

How do I add a background to a transparent png in gimp?

I have a png file with a transparent background. I would like to add a non-transparent background from a jpg. I have tried: Open the transparent png file. I see the picture with the checkerboard ...
1
vote
0answers
45 views

Aurora Firefox “Sync encountered an error while synchronising: Unknown error. Sync will automatically retry this action.”

Firefox keeps giving me this error: "Sync encountered an error while synchronising: Unknown error. Sync will automatically retry this action." I'm able to login, but some minutes later... bam! the ...
1
vote
0answers
123 views

ffmpeg: change alpha channel of a showwaves filter

I've been trying to figure this issue out for a few hours and I can't seem to find any solution. I'm creating a video from an .mp3 and some images with the following command fmpeg.exe -y -i ...
0
votes
0answers
148 views

using avconv to convert rbga image sequence into video while preserving alpha chanel

Is there any way to use "avconv" to convert a sequence of png images with alpha channel into a video and preserving the alpha channel? $ avconv -f image2 -framerate 60 -i img_%5d.png -r 29 foo.mp4 ...
3
votes
1answer
286 views

overlay a sample video with alpha channel over another video in gstreamer

I want to play 2 video files using a GStreamer pipeline on my screen. The first video is without an embedded alpha channel and I want the second video with an embedded alpha channel to be overlaid ...
1
vote
0answers
256 views

opensource vp6a encoding

I am looking for a way to encode a movie with vp6a. I was hoping I would be able to do this with ffmpeg using this command: ffmpeg -i test.flv -loop 1 -i bg.tga -vcodec vp6a -vframes 1037 -b:v 1024k ...
1
vote
1answer
638 views

How do i convert a transparent .mov-file to an mp4 file overlayed on a background-image using FFMPEG

I'm trying to convert a mov file with the following specs: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov': Metadata: major_brand : qt minor_version : 537199360 ...
10
votes
1answer
1k views

get pixel alpha value

Given a pixel in an image imported from a png file, how can I get the alpha value of the pixel with the GIMP? If this is not possible, what software can I use to achieve this (OS: Linux)?
1
vote
1answer
233 views

How to combine multiple similar images with “holes” into one good one?

Suppose you have multiple photos of the same object (from slightly different angles), each have some obstacles in foreground. You added an alpha channel to each picture and "erased" the obstacle ...
1
vote
0answers
410 views

.MOV video compressed with PNG has no alpha channel

I have a QuickTime file .mov with alpha channel compressed with PNG codec. What I need is to create smaller version of this file using ffmpeg. Everything works except new mov has no alpha (Adobe After ...
1
vote
0answers
190 views

Render Video as png with Alpha

I have pixel art that I want to put in an animated png. I animated it in the timeline, but when I rendered it into a series of pngs, It has no partial transparency. Anyone know how to solve this?
2
votes
1answer
512 views

Keep alpha transparency in indexed PNG from Fireworks when batch resizing using convert (ImageMagick)

I have a special case where I'm using alpha transparency in indexed PNGs from Fireworks to keep the file size of PNG's in an iOS game down. (That is, indexed colors like an 8bit PNG but alpha ...
0
votes
2answers
65 views

How can I convert the color in this button into an alpha transparency so that any background will show through, changing the color of the button?

The button has a layer in it that has a bevel/emboss filter on it. I'm stumped. Here's the PSD that I'm trying to convert.
3
votes
4answers
2k views

Is there any way to save a PNG-8 file with Alpha Transparency in Photoshop?

I recently discovered something that I previous thought was impossible: PNG-8 files can store Alpha Transparency in the same way as PNG-32 files can. Not Indexed Transparency (like GIFs), but full on ...
0
votes
1answer
1k views

Convert TIFF with Alpha Channel to PNG?

I have a TIFF File that has a blue background and an Alpha Channel. I would like to save a PNG File which has the blue background transparent, using the Alpha Channel (because some pixels are not ...
4
votes
8answers
7k views

Extracting the layer transparency into an editable layer mask in Photoshop

Is there any simple way to extract the "baked in" transparency in a layer and turn it into a layer mask in Photoshop? To take a simple example: Let's say that I paint a few strokes with a ...
1
vote
1answer
559 views

Alpha plugin in GStreamer not working

I'm trying to compose two videos, and I'm using the alpha plug-in to make the white color transparent. To test the alpha plug-in I'm creating the pipeline with gst-launch. The first test I done was: ...
5
votes
2answers
3k views

Point sample opacity/alpha in Adobe Photoshop?

I opened a PNG containing an alpha channel in Photoshop and wanted to get the opacity / alpha of a given point in the PNG file, so that I could match that opacity in a new photoshop layer. How can I ...