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• Detect Alpha Channel with ImageMagick

  - by brad

  Scenario I would like to save images with alpha transparency as .png and images without alpha transparency as .jpg (even if their original format is .png or .gif). How can I detect whether or not an image has alpha transparency using ImageMagick?

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• WPF WriteableBitmap

  - by Sam

  I'm using WriteableBitmap on an image of type Bgra32 to change the pixel value of certain pixels. I'm setting the value to 0x77CCCCCC. After calling WritePixels, the pixels I set to 0x77CCCCCC show up with a value of 0x77FFFFFF. Why does this happen? How do I make the pixels have the correct value?

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• Generating video or images of geometrical objects from data

  - by Jonathan Barbero

  Hello, I'm working in a course's project to predict the velocity and position of the solar system planets (and other objects). It will be really cool if I can visualize the predicted objects data, if it's possible generating 3D images, if in video that's amazing. Do you know any library that lets me to use this data to generate an image or video? (I don't care in which language) Data: - simulation step (time line step for a video) - positions of the objects - radius and/or colours of the objects Thanks in advance, any suggestion is welcome.

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• something like gimp "fuzzy select" in python/PIL

  - by Adam

  I have image with some object at not solid background. I want to extract this objects like in gimp using "fuzzy select". This can be an example: http://img249.imageshack.us/gal.php?g=25750902.png Question is what is the best way to do it using python/PIL...

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• possible to have a background color transition from color A to color B without repeating a pixel sti

  - by Andrew Heath

  For things like menubars and headers, a background color is nice. But a background color that gracefully transitions from say Blue to White is even nicer. I know this can be done by making a 1-pixel wide, X-pixel tall image file containing the desired fade and repeating it across the div, but does CSS have native support to just define colors and be done with it? Can any other language handle this?

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• Training sets for AdaBoost algorithm

  - by palau1

  How do you find the negative and positive training data sets of Haar features for the AdaBoost algorithm? So say you have a certain type of blob that you want to locate in an image and there are several of them in your entire array - how do you go about training it? I'd appreciate a nontechnical explanation as much as possible. I'm new to this. Thanks.

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• Get width of a single character from ttf-font in php?

  - by Martti Laine

  Hello I'm creating an dynamic image, which creates headers on my page using PHPs GD-library. The problem is, that I need a line-wrapping system. It's not a problem itself, but first I need to get the width (in pixels) of current character. I'm pretty curious about this, is there any way? Or do I need to manually specify width of every abc? Martti Laine

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• Machine learning - training step

  - by palau1

  When you're using Haar-like features for your training data for an Adaboost algorithm, how do you build your data sets? Do you literally have to find thousands of positive and negative samples? There must be a more efficient way of doing this... I'm trying to analyze images in matlab (not faces) and am relatively new to image processing.

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• CSS body Background Centered to be aligned with content

  - by salsanz

  I want to put a Background image centered in the body (backgroundPosition). And then I want all the content(text, tables....) I will add to the page to be aligned with the background, for example, If I zoom the Page, the proportions Background-Content should be respected. I tried almost everything and I don't know if Its possible, I know if I use position top-left for background position and then content in float:left proportions will be respected, but If I want background centered?

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• How to resize .jpg images in Java?

  - by Daeyun

  This is what I want to do: Input: ArrayList that contains a bunch of .jpg URLs Download the image (using HttpURLConnection maybe?) Resize Save as xxx.jpg, locally I don't know where to start. I'd appreciate if anyone can tell me what to study to do the steps 1~3.

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• Images in web apps

  - by DJPB

  I'm working on a web application and I'm using the img tag (<img...>). When the src property is empty, it shows the red x figure indicating that there is no image. Is there any way to hide that red X icon?

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• How to merge two images into a single Jpeg

  - by TooFat

  I need to be able to take multiple images and overlay a smaller one on top of a larger one and save the result as a single image. How would I go about accomplishing this in C#?

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• problem with background subtraction

  - by riyana

  I'm doing background subtraction using opencv. The problem is the foreground object is not always detected correctly. To deal with this I would like to use four or five images, and take their average as the background image. How can I do that?

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• UIImage resize and crop to fit

  - by Amit Hagin

  I read a lot, also here, but couldn't find a simple way to do it: In objective c - I have a big UIImage and a small UIImageView. I want to programmatically shrink the content of a UIImage just enough to fit the smaller dimension within the UIImageView. The larger dimension will be cropped, and the result will be the maximum I can get from an image without changing the proportion. can you please help me?

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• High speed matrix manipulation in c#?

  - by Donnie

  I'm working on some image manipulation code in c# and need to do some matrix operations (specifically 2D convolution). I have the code written in matlab which uses the conv2 function ... is there a library for C# / .NET that does good high-speed matrix manipulations? I'd be fine if it requires some specific GPU and does the matrix math on-GPU if that's what it takes.

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• Get images from a URL and retrieve them all to select the one which is the biggest.

  - by daniel

  I want to open a URL and RegEx all the image's URLs from the page. Then I want to cURL all of them and check what size they have. In the end I want to get the biggest one. How do I do this?

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• Background images in <a> tag inside <li> tag not dissapears in IE6 and IE7

  - by Sixfoot Studio

  Hi Guys, In IE7 and in IE6, I have an anchor inside of an li which has a background image in it. When you mouse over these links, the backagound images go missing in these browsers. Any ideas as to why this would happen? Here's an example (IE7 and IE6): http://bit.ly/dekwva Many thanks, James

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• c# Resize Function

  - by Tyler

  So my logic is flawed and I need a better and correct way to resize an image in my c# app I need a function similar to this setup public void ResizeImageForWeb(string OriginalFile, string NewFile, int MaxWidth, int MaxHeight, int Quality) { // Resize Code } Basically, I'm a web designer lost trying to programming a desktop app.

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• How can I alter anythingSlider so that it disables the next / previous buttons when only 1 <li> in t

  - by madphill

  I have a page with multiple instances of anythingSlider on it and I'm using PHP to dynamically load pages that swap out the content in them. Reference: http://ceedcreative.com/CEED_2.0/ I would like to edit the anythingSlider to disable the previous / next buttons if the UL it's displaying only has one LI within it. In other words, no buttons, just a clean div that's the same heigh and width (no scrolling) if there's only one image.

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• whats best way to create documents Archive of images in the database's ?

  - by ulduz114

  What is the best way to create an Archive of image documents in the database ? Given we have about 2-10 million records and each record includes 2-4 images and about 20 text fields , what is the best way for create this archive so that we have good speed and high security for data? Also, what database is good for this project?

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• open corel draw file into photoshop

  - by air

  i have one coral draw file and i don't have coral draw software with me. is this possible to open that file in PSD or convert into PSD or image format. i search on internet but didn't find any free software or plug in. Thanks

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• print a picture from php

  - by robertdd

  how i can print a picture from php? when i acces the link: http://localhost/autovi/thumb.php?gsbxdsdc where the gsbxdsdc is the name of the image i have in my html this: <a href=""> <img src="http://localhost/autovi/thumb.php?gsbxdsdc" id="gsbxdsdc"> </a>

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• Filling pattern changes with object's position. Java.

  - by Gabriel A. Zorrilla

  I created a bufferedimage which i applied to a Rectangle to use as filling pattern to shape S. If i change S's position, the filling pattern changes with it instead of remaining "fixed". What could it be? Image: (the pattern is a 3 stripes, all with the same aspect ratio) :

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• How to capture each frame of a USB webcam using VB.net?

  - by Kevin Boyd

  While I have got some leads from an older SO post and from this site, I haven't been able to figure out how to capture each frame of a web-cam. What I would like to do is something like this capture a frame then do some image processing on it and display the output and then move on to the next frame. Can I can access to web-cam frame events or is there any efficient way to achieve this?

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• sIFR: page refresh causes background images problems in IE8

  - by Basten

  I'm using sIFR 3 r436. When a page is reloaded, and often also on load, in IE8 the background image does'nt appear completely. When clicking on an intern link the background is displayed correctly. Google Chrome has also minor problems in displaying. This is the test document: http://testserver.simplexontwerp.nl/sifr/ I have been testing a lot of different options, also older versions of sIFR, but nothing helps. It would be great if someone could help me!

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