473,396 Members | 1,810 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,396 software developers and data experts.

Fast image sharpning

Hi guys,

We've got a content management system in PHP that allows users to upload
images that are resized and sharpened.

The resizing is done using the GD libraries resampling function and to
sharpen it I use a convolution function that goes though every pixel in the
image and using the neighboring pixels plots the new value over it.
Unfortunatly the convolution is rather slow and takes a long time (I guess
because there are so many loops involved).

Is there a quicker way to sharpen an image? I've tried using the command
line program ImageMagick but unfortunatly I can't get it to work (see my
previous post), are there any optimised sharpen functions or pluggins for
PHP that would speed the process up?
Thanks,
Andrew
Jul 17 '05 #1
0 1563

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

20
by: GS | last post by:
The stdint.h header definition mentions five integer categories, 1) exact width, eg., int32_t 2) at least as wide as, eg., int_least32_t 3) as fast as possible but at least as wide as, eg.,...
6
by: Cable | last post by:
Hello, I am hoping that someone can answer a question or two regarding file access. I have created an app that reads an image from a file then displays it (using OpenGL). It works well using...
4
by: Harry | last post by:
Hello, I am using a 2-dimensional matrix for image manipulation and recognition. The x-axes is image.width pixels long and the y-axes image.height. All fields have a RGB integer value. To store...
1
by: www.web20developers.com | last post by:
http://www.web20developers.com http://www.web20developers.com/index.php?option=com_content&task=view... Ajallerix : AJAX, simple, fast Web image gallery demo ; at Novell AJAX -...
15
by: Michael A. Covington | last post by:
Any thoughts about how to implement image processing algorithms to run fast in C#? Using GetPixel to access every pixel from a Bitmap seems to be rather time-consuming.
3
by: cartoper | last post by:
I am working on writing an Apache Module (in C/C++) that needs to resize (down) large images (4MB to 16MB) VERY quickly. The objective is not to make the images look great for printing, just look...
0
by: adubra | last post by:
Hi there, I am using a device context (DC) and a buffer to successfully draw to screen. However, when I update the DC at very high frame rate and drag the frame containing the image very quickly...
0
by: johot | last post by:
I am currently creating a little photo application. In this application the user is able to zoom in the image and after zooming panning around inside the zoomed image with the mouse. The strange...
7
by: dave | last post by:
Hi All. I've been formulating in my head a simple image editor. I actually started prototyping is some time ago in Java, but am liking Python more and more. My editor will be nowhere near the level...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.