boost-gil

How to combine images with boost gil?

由 依然范特西╮ 提交于 2021-02-10 06:58:18
问题 I am just getting familiar with Boost GIL (and image processing in general) and suspect that this is simple, but I haven't found the relevant documentation. I have a set of image views that I would like to combine with an arbitrary function. For simplicity, lets say the images are aligned (same size and locator type) and I just want to add the pixel values together. One approach would be to create a combining iterator from a zip_iterator and a transform_iterator, but I'm guessing that there

Boost::GIL: reading *.png image with alpha channel is missing antialiasing

由 谁说我不能喝 提交于 2021-01-28 11:41:45
问题 I'm using boost 1.74. So, without exception catches and rest stuff my actual code looks like: typedef std::vector<int32_t> FlatINT32TArr; using PreviewImageT = bg::rgba8_image_t; using PreviewViewT = bg::rgba8_view_t; using PreviewPixelT = bg::rgba8_pixel_t; void read_pixel_arr(FlatINT32TArr r_preview_flat_arr, const std::wstring& filepath) { std::ifstream byte_stream(filepath, std::ios::binary); PreviewImageT image; bg::read_and_convert_image( byte_stream, image, bg::image_read_settings<bg:

Reading png images with gil

由 有些话、适合烂在心里 提交于 2019-12-23 12:47:50
问题 Is it possible with boost::gil to read the RGB image information so that I can read the file into the correct rgbx_image_t ? With the following I have to know the type beforehand and that is not so neat. boost::gil::rgb8_image_t im; gil::png_read_image(m_filename, im); 回答1: You can make a list of types you want to try and use an any_image to hold a type-erased result: typedef mpl::vector<rgb8_image_t, rgb16_image_t> my_img_types; any_image<my_img_types> runtime_image; png_read_image("input

LibPNG + Boost::GIL: png_infopp_NULL not found

由 寵の児 提交于 2019-12-21 20:49:48
问题 I always get this error when trying to compile my file with Boost::GIL PNG IO support: (I'm running Mac OS X Leopard and Boost 1.42, LibPNG 1.4) /usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::init()': /usr/local/include/boost/gil/extension/io/png_io_private.hpp:155: error: 'png_infopp_NULL' was not declared in this scope /usr/local/include/boost/gil/extension/io/png_io_private.hpp:160: error: 'png_infopp_NULL' was not

Boost::GIL How to save image as JPEG or PNG into char*?

由 旧街凉风 提交于 2019-12-10 16:32:01
问题 So I see samples all around on saving into file. But I wonder if it is possible to save into char* or string instead of file - so to say keep it in memory? 回答1: There doesn't seem to be anything to facilitate this in boost itself. All I/O seems to be based on supplying filenames. However, there seems to be an extension here called io_new that has streams based I/O. See documentation here for an example (search for "Reading And Writing In-Memory Buffers"). 来源： https://stackoverflow.com

gil boost : convert rgb8_image_t to rgba8_image_t

由 心已入冬 提交于 2019-12-07 10:59:03
问题 I'm a little bit confusing about GIL syntax. I want to convert rgb8_image_t to rgba8_image_t and set alpha channel to 1. Is there any built-in function. If not how to do this manually? 回答1: You want to use boost::gil::copy_and_convert_pixels with a suitable matching color_convert specialisation in scope. Here's a complete example: #include <boost/gil/gil_all.hpp> #include <cassert> namespace boost { namespace gil { // Define a color conversion rule NB in the boost::gil namespace template <>

Using Boost.GIL to convert an image into “raw” bytes

由 ￣綄美尐妖づ 提交于 2019-12-07 09:08:58
问题 Goal I'm trying to move towards Boost GIL to replace some similar functionality I've implemented that is reaching the end of its maintainable life. I have existing code that works with 24 BPP, 8bit RGB images using uint8_t* . I can't change that as the same interface is used to expose images from different places (e.g. OpenGL buffers) and there's already quite a lot of code. Therefore I'm trying to use GIL in small steps, starting by reading a file and copying the pixels byte by byte into a

Using Boost.GIL to convert an image into “raw” bytes

由 寵の児 提交于 2019-12-05 16:18:06
Goal I'm trying to move towards Boost GIL to replace some similar functionality I've implemented that is reaching the end of its maintainable life. I have existing code that works with 24 BPP, 8bit RGB images using uint8_t* . I can't change that as the same interface is used to expose images from different places (e.g. OpenGL buffers) and there's already quite a lot of code. Therefore I'm trying to use GIL in small steps, starting by reading a file and copying the pixels byte by byte into a std::vector<uint8_t> which I can use to manage the storage, but still get a uint8_t* by using &vector[0]

LibPNG + Boost::GIL: png_infopp_NULL not found

由 人走茶凉 提交于 2019-12-04 13:44:32
I always get this error when trying to compile my file with Boost::GIL PNG IO support: (I'm running Mac OS X Leopard and Boost 1.42, LibPNG 1.4) /usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::init()': /usr/local/include/boost/gil/extension/io/png_io_private.hpp:155: error: 'png_infopp_NULL' was not declared in this scope /usr/local/include/boost/gil/extension/io/png_io_private.hpp:160: error: 'png_infopp_NULL' was not declared in this scope /usr/local/include/boost/gil/extension/io/png_io_private.hpp: In destructor 'boost:

Creating image with Boost.GIL

由 ╄→гoц情女王★ 提交于 2019-11-28 11:59:39
I've been trying to read the boost::gil documentation, but it's somewhere between lacking, and convoluted. Ranting aside, I need an example on how to do the following: Create an image of, say 512x512. Fill it with red pixels. Write to PNG. I can't find anything about doing any of that, at all, in the documentation for gil. Particularly the creating an image or filling it with pixels part. If anyone can help, thanks. Cubbi I haven't used GIL yet, but I want to learn it as well. Having looked at the design guide and having googled up the error related to libpng , looks like the simplest example
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