pixelformat | 易学教程

How to create a transparent bitmap in Direct2D

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问题 I need to create a transparent bitmap using Direct2D and draw, by using my device context, on it. ID2D1DeviceContext1* d2dContext = ... ID2D1Bitmap* pBitmap; d2dContext->CreateBitmap( bitmapSize, nullptr, 0, D2D1::BitmapProperties1( D2D1_BITMAP_OPTIONS_TARGET, D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED), dpiX, dpiY), &pBitmap); d2dContext->BeginDraw(); d2dContext->SetTarget(pBitmap); d2dContext->Clear(D2D1::ColorF(0, 0)); d2dContext->DrawLine(...); hr =

How to create a transparent bitmap in Direct2D

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how to convert bayerrg8 format image to rgb image

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问题 I've got a camera that provides images in Bayer RG8 format. I'm using skimage for processing images, but I could not find away to convert the Bayer RG8 format to standard RGB (to display on screen). Is there any way to do this with skimage? I did find a reference to opencv conversion, but I'm trying to avoid including opencv in my app (unless it is absolutely necessary). 回答1: As you have not provided any input data, I took the greyscale image from here and made it into a raw Bayer8 file with

OpenGL pixels drawn with each horizontal pair swapped

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问题 I'm somewhat new to OpenGL though I'm fairly sure my problem lies in the pixel format being used, or how my texture is being generated... I'm drawing a texture onto a flat 2D quad using a 16bit RGB5_A1 pixel format, though I don't make use of any alpha at this stage. The problem I'm having is that each pair of horizontal pixel values have been swapped . That is... if the pixels positions should be in this order (assume 8x2 image) 0 1 2 3 4 5 6 7 they are instead drawn as 1 0 3 2 5 4 7 6 Or,

Creating a Javafx image from a int array

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问题 I am desperately trying to create an Image from a pixel-array with integer values. Regardless of using the WritableImage or the Canvas, it is always said that the PixelFormat is BYTE_RGB or BYTE_BGRA_PRE, so that I am forced to use a byte-array. Is there any way to change the PixelFormat to <IntBuffer> or did I overlook another component that is capable of having a PixelFormat<IntBuffer> ? 回答1: You haven't described the structure of the pixel data in your int[] , but you can do something

Incorrect transformation of frames from YUV_420_888 format to NV21 within an image reader

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问题 I configured my code in order to get a stream of YUV_420_888 frames from my device's camera using an imageReader object and the rest of the well known camera2 API. Now I need to transform these frames to NV21 pixel format and call a native function which expect a frame in this format to perform certain computations. This is the code I am using inside the imagereader callback to rearrange the bytes of the frame: ImageReader.OnImageAvailableListener readerListener = new ImageReader

Image resize results in massively larger file size than original C#

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问题 I've been using this method to resize uploaded .JPG images to a max width, but it's resulting in images being larger in kb than the source. What am I doing wrong? Is there something else I need to do when saving the new image? I've tried all sorts of combinations of PixelFormat , e.g. PixelFormat.Format16bppRgb555 E.g: source image is a .JPG 1900w, trying to resize to 1200w... - Source file is 563KB, - resized file is 926KB or larger, even 1.9MB public static void ResizeToMaxWidth(string

Check If Image Is Colored Or Not

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问题 I'm trying to figure out whether an image is colored or not. On this StackOverflow question, there's a reply that says that I should check the PixelFormat enum of the Image . Unfortunately, the reply isn't very clear to me. Is it safe to check whether the image.PixelFormat is different from PixelFormat.Format16bppGrayScale to consider that it is a colored image? What about the other values of the enumeration? The MSDN documentation isn't very clear... 回答1: You can improve this by avoiding

What is PixelFormat.RGBX_888

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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.

Incorrect transformation of frames from YUV_420_888 format to NV21 within an image reader

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I configured my code in order to get a stream of YUV_420_888 frames from my device's camera using an imageReader object and the rest of the well known camera2 API. Now I need to transform these frames to NV21 pixel format and call a native function which expect a frame in this format to perform certain computations. This is the code I am using inside the imagereader callback to rearrange the bytes of the frame: ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() { @Override public void onImageAvailable(ImageReader mReader) { Image image = null;