rgba

The buffer allocated is insufficient when encoding to Rgba16 UWP

由 血红的双手。 提交于 2019-12-12 02:39:05
问题 I am encoding a Canvas control which contains Textblocks as child using the following code but I get The buffer allocated is insufficient My code using(InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream()) { var displayInformation = DisplayInformation.GetForCurrentView(); var renderTargetBitmap = new RenderTargetBitmap(); await renderTargetBitmap.RenderAsync(Textify.CanvasControl); var width = renderTargetBitmap.PixelWidth; var height = renderTargetBitmap.PixelHeight; IBuffer

getting rgba background color by jquery

由 时光总嘲笑我的痴心妄想 提交于 2019-12-12 02:29:23
问题 I have an element with background-color:rgba(1,0,0,0) and I need to get this value by jquery to do something. I tried $('.overlay').css("backgroundColor") but it returns transparent . is there any way to get the rgba background-color of an element by jquery ? by the way, here are my codes : html : <div class="overlay"></div> css: .overlay { background-color:rgba(1,0,0,0) } jquery : $('.overlay').css("backgroundColor"); 回答1: As @codingstill points out, Firefox returns transparent . But you

text rendering is screwed with “gradient” on IE

由 本小妞迷上赌 提交于 2019-12-11 13:47:45
问题 RGBA -- workaround for IE is “DXImageTransform.Microsoft.gradient".Found a handy tool provided by www.css3please.com for cross browser transparency,but applying this gradient on IE(IE8) -- works,but the text loses its clearness/legibility. applying georgia to make the font look uniform on all the browsers,but the text does not appear properly after i apply gradient . Here's the JSFiddle http://jsfiddle.net/mvivekc/GJaDy the code is-- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional/

How to set RGBA Color of a Pixel of an UIImage

由 爱⌒轻易说出口 提交于 2019-12-11 03:13:04
问题 I am looking for a possibility to set (change) the RGBA color of a Pixel of an UIImage for my Iphone Application. (I actually want to implement some floodfill stuff) So I need something like this: -(void) setPixelColorOfImage: (UIImage*) img atXCord: (int) x atYCord: (int) y withRedColor: (CGFloat) red blueColor: (CGFloat) blue greenColor: (CGFloat) green alpha: (CGFloat) alpha { // need some code her } Because this method will be called quite often, it shouldn't be too slow. Please help. 回答1

changing rgba alpha transparency with jquery [duplicate]

由 ℡╲_俬逩灬. 提交于 2019-12-10 16:05:04
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: jQuery + RGBA color animations hey, i want to change the opacity of an rgba value on hover, but the opacity stays at .07.. maybe ou can help me find the mistake. CSS (IE hacks are in seperate file - no need to mention them here) .boxcaption{ float: left; position: absolute; height: 100px; width: 100%; background: rgb(255, 144, 11); background: rgba(255, 144, 11, 0.7); } JS var thumbslide = $('.boxgrid

iPhone App - Display pixel data present in buffer on screen

由 余生长醉 提交于 2019-12-10 00:34:41
问题 I have the source code for a video decoder application written in C, which I'm now porting on iphone. My problem is as follows: I have RGBA pixel data for a frame in a buffer that I need to display on the screen. My buffer is of type unsigned char. (I cannot change it to any other data type as the source code is too huge and not written by me.) Most of the links I found on the net say about how to "draw and display pixels" on the screen or how to "display pixels present in an array", but none

How do I set the R, G, B and Alpha components of a color?

由 爷，独闯天下 提交于 2019-12-09 02:53:33
问题 There are 3 integer values that makes up a RGB value, and also i have the Alpha component value of the color. how do i set these 4 values to get the desired colour 回答1: You can create a Color object (the values should either be ints between 0 - 255 or floats between 0f - 1f : Color c = new Color(red, green, blue, alpha); If you want to paint an image with that color: BufferedImage image = new BufferedImage(300, 200, BufferedImage.TYPE_INT_ARGB); Graphics graphics = image.getGraphics();

Calculate source RGBA value from overlay

由 泪湿孤枕 提交于 2019-12-08 08:59:57
问题 The title looks a bit weird, so here is a sample: You will probably be familiar with the Windows 7 Explorer. When you select something with the pressed left mouse button, you get a blue half transparent rectangle. So the question is now: It is possible to calculate the source RGBA color that was used to draw this rectangle? The only things I know is the RGB value from the background and the RGB value with the blue overlay. Here is a screenshot from what I mean: 回答1: No, it ist not possible

PHP - Convert CMYK colour values to RGBA

由 有些话、适合烂在心里 提交于 2019-12-08 08:38:57
问题 I need to convert CMYK values to RGBA values, but have yet to stumble upon an algorithm for this that just works. I already have the RGBA to CMYK via the following: Convert RGBA to RGB Convert RGB to CMYK Below are the algorithms I'm using for the above two bullet points: RGBA to RGB return substr($rgba, 0, -2); ... what? Nothing wrong with that! :D RGB to CMYK $c = 255 - $r; $m = 255 - $g; $y = 255 - $b; $b = min($c, $m, $y); $c = round(($c - $b) / (255 - $b)); $m = round(($m - $b) / (255 -

What is PixelFormat.RGBX_888

由 半城伤御伤魂 提交于 2019-12-07 05:47:45
问题 As the title said, anyone know what is RGBX_8888 pixel format? and what is the difference with RGBA_8888? Is RGBA_8888 offers an alpha channel but RGBX_8888 does not? The android documentation does not give much information on this unfortunately. Thanks. 回答1: RGBX means, that the pixel format still has an alpha channel, but it is ignored, and is always set to 255. Some reference: Blackberry PixelFormat (It is not android, however I guess that the naming conventions stay same across platforms.
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