Only PNG supports transparency, is that true?

I found JPG does not support transparency, the alpha value is always 255. I am wondering only png supports transparency? Answer png-32 supports different levels of transparency. Each pixel can have an opacity between 0 and 255, with 0 as completely transparent. png-24 supports setting one color as fully transparent. Everything else will be opaque. … Read more

ImageMagick extend canvas with transparent background

convert input.png -extent 100×100 -gravity center -background white output.png If the input is 50×50 the surrounding background is white. Can I somehow set this to transparent without declaring any color within input as transparent? Answer Use this instead: convert \ input.png \ -background none \ -gravity center \ -extent 100×100 \ output.png Note well: The … Read more

How to find the alpha channel transparency value of a pixel in a png image? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 5 years ago. Improve this question I have an image that has alpha channel transparency. I want to recreate the same background color with RGBA … Read more

WPF Window with transparent background containing opaque controls [duplicate]

This question already has an answer here: Change Background opacity without changing content opacity (1 answer) Closed 6 years ago. I have a window with the following appearance: What I would like, however, is if the Button controls (the gray ones with text in the middle) in the Window‘s main Grid had an opacity of … Read more

How to make transparent gradient?

I have the following gradient: <?xml version=”1.0″ encoding=”utf-8″?> <shape xmlns:android=””> <gradient android:startColor=”#ECECEC” android:centerColor=”#F6F6F4″ android:endColor=”#F8F8F6″ android:angle=”90″ android:dither=”true” /> </shape> I want this to be transparent because in my ListView I am setting this as my ListSelector: <ListView android:layout_width=”fill_parent” android:layout_height=”fill_parent” xmlns:android=”” android:id=”@+id/ARListView” android:background=”@drawable/transparent_background” android:cacheColorHint=”#00000000″ android:drawSelectorOnTop=”true” android:listSelector=”@drawable/stocks_selected_gradient”> </ListView> Answer Just use an 8-digit color value, e.g. #FFF8F8F6, where … Read more

How to make an OpenGL rendering context with transparent background?

Rendering contexts usually have a solid color on the background (black or whatever, see the image below): I’m wondering if it’s possible to setup a window, with no decorations AND with the transparent background, while allowing me to render OpenGL stuff on it. This would give the illusion that the triangle is floating on the … Read more