jpeg

Symfony2 forcing jpg download returns corrupted file

由 女生的网名这么多〃 提交于 2019-12-25 07:38:32
问题 Following some of the many posts related to the subject I finally came up with this version of the "force download" code: public function downloadAction(Request $request){ $filename= 'test.jpg'; $response = new Response(); $response->headers->set('Content-Type','image/jpg'); $response->headers->set('Content-Disposition', 'attachment; filename="' . basename($filename) . '"'); $response->sendHeaders(); $response->setContent(file_get_contents($filename)); return $response; } Now, this works fine

Not a JPEG file: starts with 0x0a 0x4c Error

由 喜欢而已 提交于 2019-12-25 07:25:44
问题 I'm trying to import a bunch of images of .jpeg file format. However I'm getting the error Not a JPEG file: starts with 0x0a 0x4c Now, I know 0x89 0x50 is how .png files start. But I can't understand what 0x0a 0x4c represents. I also ran the file image001.jpeg command on the terminal and it gave me JPEG image data, JFIF standard 1.01 . Also, when I'm importing these group of images, this error is thrown for different files each time, not the same ones. So, I guess it isn't an issue of the

JPEG - Can EOI Marker appear inside image data after SOS?

由 为君一笑 提交于 2019-12-25 04:34:16
问题 I understand that a JPEG file starts with 0xFFD8 (SOI), followed by a number of 0xFFE n segments holding metadata, then a number of segments holding the compression relate data (DQT, DHT, etc) of which the final one is 0xFFDA (SOS); then comes the actual image data which ends with 0xFFD9 (EOI). Each of those segments states its length in the two bytes following the JPEG marker so it is a trivial execise to calculate the end of a segment/start of next segment and the start of the image data

jpg image not displaying in safari (iphone 3gs and ipod)

由 瘦欲@ 提交于 2019-12-25 04:22:10
问题 I have this image : "http://interstatic01.gameloft.com/igp/videos/images/d9/end_screen_71.jpg" In this very simple html, it doesn't display for the 2 devices mentioned in the title. <!DOCTYPE html> <html> <head> </head> <body> <div ><!-- it may show full image depending on browsers, eg: firefox --> <img src="https://i.stack.imgur.com/nXxT5.jpg" /> </div> </body> </html> Note: if i enter the url directly in the url bar of the safari browser, i can see it. It just happens when it is in a tag or

Extract small portion of image without loading all of it [closed]

由 为君一笑 提交于 2019-12-25 02:55:10
问题 Closed. This question is off-topic. 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 . I have large JPG images ( say 20000x10000 pixels) and want to extract sub-images from these images without loading whole image. I found it's possible by using this ImageMagick command: convert -extract 226x248+4216+3377 a.jpg o.jpg But I need to have it in my C# WPF app. Magick.NET did not implement extract

PIL and JPEG library on Windows

由 痴心易碎 提交于 2019-12-25 02:34:20
问题 I have built Python's PIL library from source (due to an error in the version installed from the installer executable) and can create Image() objects from jpg files on the build computer, however when I package this Python application using PyInstaller, the application is unable to open JPEG images. Have I not built PIL correctly, as described at PIL encoder jpeg not available, or is something else wrong? Update: The error message is "IOError: encoder jpeg not available". Edit: The problem

Imagick Error convert tiff to pdf

由 家住魔仙堡 提交于 2019-12-25 02:29:30
问题 When I tried converting a picture via : convert image.tiff image.pdf It thorws the error: convert: no images defined `mosaic.jpeg' @ error/convert.c/ConvertImageCommand/3187. I tried installing and reinstalling imagick , libtiff and jpeg. But it didn't help. It used to work on the same machine (Mac Mavericks) but I had to reboot my machine and reinstall everything, and now it doesn't work. Thank you. **(UPDATE) Issue Resolved: ** Installed GraphicMagick instead and worked! 回答1: Are you using

Is there anyway to configure twelve monkeys JPEGSegmentUtil segment reader to read all segments of a JPEG

由 时间秒杀一切 提交于 2019-12-25 01:55:43
问题 I am currently prototyping functionality in an app I wish to create, which requires the ability to read/modify/write metadata of a jpeg file. One way I thought might work for this is to use the twelve-monkeys java API to read all segments in, modify those metadata segments I am interested in, and write all the segments (most of them being unmodified) back to a new file. In my prototyping I came across a hurdle which triggered a question I, I have to admit, direct mainly at the author of the

How to save and name multiple plots with R

由 好久不见. 提交于 2019-12-25 01:46:25
问题 I have a list of 73 data sets generated by the function "mcsv_r()" called "L1" and a function "gc()" that generates a map. Using "lapply" I can create my 73 plots. I need to save and name all of them. I know I can do it one by one with RStudio. But I am sure that thanks to "jpeg()" and "dev.off" and mixing them with a loop I can do it with a few lines of code. out <- setwd("C:/") dir(out) mcsv_r(dir(out)) gc <- function(x){ xlim <- c(-13.08, 8.68) ylim <- c(34.87, 49.50) map("world", lwd=0.05

JPEG images have different pixel values across multiple devices

由 試著忘記壹切 提交于 2019-12-25 01:34:31
问题 I had noticed that when reading in an identical photograph across devices in the JPEG format, the pixel values do not match up. They are close, but different. When converted to PNG files, the pixel values seem to match up. This would seem that it would be due to the (un)compression algorithms across devices. That's what comes to mind anyways. Is there a way to read in JPEG files so that the same pixels are retrieved from the photograph across devices? I don't see an option within the
订阅 jpeg