png

问题 I have a PNG image file.I want to convert it to GeoTiff. I installed QGIS software but i can not use it and i dont know how to Georeference the image. Please help me. is there any online software ? 回答1: This is a pretty good tutorial with step by step instructions on how to georeference an image in the GUI. http://www.qgistutorials.com/en/docs/georeferencing_basics.html 回答2: If you wish to do it instantly, the quickest option will be via the link below: https://mygeodata.cloud/converter/png

问题 I have a PNG image file.I want to convert it to GeoTiff. I installed QGIS software but i can not use it and i dont know how to Georeference the image. Please help me. is there any online software ? 回答1: This is a pretty good tutorial with step by step instructions on how to georeference an image in the GUI. http://www.qgistutorials.com/en/docs/georeferencing_basics.html 回答2: If you wish to do it instantly, the quickest option will be via the link below: https://mygeodata.cloud/converter/png

问题 I am not sure what I am exactly doing here so please give some advise and forgive the mistakes. I have a image byte[] called idCardImage and I did the following to convert it to a String: String s = new String(idCardImage); And it prints out like this: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAEHUlEQVQ4TzWUW49VRRCFv6rq3ufMmTNn.... Did some search online and it seems this image is in a png format with base 64 encoded. What I need to do is to convert it to a jpeg

问题 I'm trying to create a thumbnail image it returned an error, that imagecopyresized() expects 2 parameter to be resource, but it can create the image but the output is only a small black image. here is my code $image = "asd.PNG"; $image_size = getimagesize($image); $image_width = $image_size[0]; $image_height = $image_size[1]; $new_size = ($image_width + $image_height)/($image_width*($image_height/45)); $new_width = $image_width * $new_size; $new_height = $image_height * $new_size; $new_image

问题 I created a simple form to test in winapi: I uploaded here: http://pastebin.com/7dNjE1Tb I would like to put a simple png file to my hwnd, for example this picture: http://www.ledavi-network.com/includes/images/bg_shadow_png.png I know I should use this: http://msdn.microsoft.com/en-us/library/windows/desktop/dd145141(v=vs.85).aspx but I am very new in winapi and I dont find any example how to use this TransparentBlt function. Someone could help me to create a very simple example? EDIT: But

问题 I'd like to do this in a platform independant way, and I know libpng is a possibility, but I find it hard to figure out how. Does anyone know how to do this in a simple way? 回答1: There is a C++ wrapper for libpng called Png++ . Check it here or just google it. They have a real C++ interface with templates and such that uses libpng under the hood. I've found the code I have written quite expressive and high-level. Example of "generator" which is the heart of the algorithm: class PngGenerator :

问题 GM is unable to identify background transparency of PDF and PNG created using "gm convert" gets white background while same PDF is converted to PNG with transparent background by IM. $convert -verbose /var/tmp/abc.pdf /var/tmp/abc.png /var/tmp/magick-16370Tq7WYv5U54Pa1 PNG 288x720 288x720+0+0 8-bit sRGB 20.7KB 0.000u 0:00.009 /var/tmp/abc.pdf PDF 288x720 288x720+0+0 16-bit sRGB 20.7KB 0.000u 0:00.000 /var/tmp/abc.pdf=>/var/tmp/abc.png PDF 288x720 288x720+0+0 8-bit sRGB 17c 16.6KB 0.010u 0:00

问题 GM is unable to identify background transparency of PDF and PNG created using "gm convert" gets white background while same PDF is converted to PNG with transparent background by IM. $convert -verbose /var/tmp/abc.pdf /var/tmp/abc.png /var/tmp/magick-16370Tq7WYv5U54Pa1 PNG 288x720 288x720+0+0 8-bit sRGB 20.7KB 0.000u 0:00.009 /var/tmp/abc.pdf PDF 288x720 288x720+0+0 16-bit sRGB 20.7KB 0.000u 0:00.000 /var/tmp/abc.pdf=>/var/tmp/abc.png PDF 288x720 288x720+0+0 8-bit sRGB 17c 16.6KB 0.010u 0:00

问题 I am building a product configuration module which requires that multiple transparent PNGs of the same size (which represent product parts) be flattened onto one image. At first I tried this which made the composition of the 3 images but on a black background: <?php $x = 500; $y = 500; $final_img = imagecreatetruecolor($x, $y); $images = array('1.png', '2.png', '3.png'); foreach ($images as $image) { $image_layer = imagecreatefrompng($image); imagecopy($final_img, $image_layer, 0, 0, 0, 0, $x

问题 I am building a product configuration module which requires that multiple transparent PNGs of the same size (which represent product parts) be flattened onto one image. At first I tried this which made the composition of the 3 images but on a black background: <?php $x = 500; $y = 500; $final_img = imagecreatetruecolor($x, $y); $images = array('1.png', '2.png', '3.png'); foreach ($images as $image) { $image_layer = imagecreatefrompng($image); imagecopy($final_img, $image_layer, 0, 0, 0, 0, $x