The JPEG compression encoding process splits a given image into blocks of 8x8 pixels, working with these blocks in future lossy and lossless compressions. [source] It is also mentioned that if the image is a multiple 1MCU block (defined as a Minimum Coded Unit, 'usually 16 pixels in both directions') that lossless alterations to a JPEG ...
I have around 1000 pdf filesand I need to convert them to 300 dpi tiff files. What is the best way to do this? If there is an SDK or something or a tool that can be scripted that would be ideal. ...
I saw a question on reverse projecting 4 2D points to derive the corners of a rectangle in 3D space. I have a kind of more general version of the same problem: Given either a focal length (which can be solved to produce arcseconds / pixel) or the intrinsic camera matrix (a 3x2 matrix that defines the properties of the pinhole camera mo...
Is it possible to dynamically create and modify images on a per pixel level in JavaScript (on client side)? Or has this to be done with server based languaged, such as PHP? My use case is as follows: The user opens webpage and loads locally stored image A preview of the image is displayed The user can modify the image with a set of s...
Hi, I need to resize an image, but the image quality cannot be affected by this. (C#) ...
I'm currently using ImageMagick to determine the resolution of images uploaded to the website. By calling ImageMagick's "identify" on the command line it takes about 0.42 seconds to determine a 1MB JPEG's resolution along with the fact that it's a JPEG. I find that a bit slow. Using the Imagick PHP library is even slower as it attemps t...
Hi, I am using c# 2005 i want to write string diagonally on image. But by default c# provides the option to write horizontally or vertically. how we write diagonally? Thanks ...
I've recently come across a problem which requires at least a basic degree of image processing, can I do this in Python, and if so, with what? ...
I'd like to make status icons for a C# WinForms TreeList control. The statuses are combinations of other statuses (eg. a user node might be inactive or banned or inactive and banned), and the status icon is comprised of non-overlapping, smaller glyphs. I'd really like to avoid having to hand-generate all the possibly permutations of ...
C# question (.net 3.5). I have a class, ImageData, that has a field ushort[,] pixels. I am dealing with proprietary image formats. The ImageData class takes a file location in the constructor, then switches on file extension to determine how to decode. In several of the image files, there is a "bit depth" field in the header. After ...
We create thumb images on our server and I'm looking for a way to save metadata (text) in that image. Is that possible? At this moment we use PHP and we create JPG images. ...
For an image hosting web application: For my stored images, is it feasible to create thumbnails on the fly using PHP (or whatever), or should I save 1 or more different sized thumbnails to disk and just load those? Please explain your reasoning. Any help is appreciated, thanks. ...
What is the best way to create a webservice for accepting an image. The image might be quite big and I do not want to change the default receive size for the web application. I have written one that accepts a binary image but that I feel that there has to be a better alternative. ...
I need to put an alpha blended gradient border around an image. My problem is in blending the corners so they are smooth where the horizontal and vertical gradients meet. I believe there is a standard algorithm that solves this problem. I think I even encountered it in school many years ago. But I have been unsuccessful in finding any...
I have a table that is dynamically created using DIVs. Each row of the table has two images. I want to set the height for the div (that represents a particular row) to the height of image that is greater of the two images being displayed in that particular row. The images to displayed will always change, and they are from an external ser...
What tools do you use to annotate images? I mean, for example, placing a screenshot into documentation with some text bubbles, arrows, numbers for references in text and so on. Sure, you can do all of these in general graphics editor, but a specialized tool (or plugin for a generic editor) would be so much nicer and should produce more...
What is the best way to convert a eps image to a png? Edit: The original question asked to preserve vector information, but it was pointed out that png is a raster format. The revised question therefore no longer asks for preservation of vector information. ...
Normally I used imagecreatefromjpeg and then getimagesize(), but with firefox 3 I need to go round this different. So now im using imagecreatefromstring( ), but how do I retreive the images dimesions now ? ...
I would like to programmatically create a gloss effect on an Image, kinda like on the Apple-inspired design that the Web has adopted when it was updated to 2.0 Beta. Essentially this: Now, I see two approaches here: I create one image which has an Alpha channel with the gloss effect, and then I just combine the input and the gloss al...
Is there a cheap way to get the dimensions of an image (jpg, png, ...)? Preferably, I would like to achieve this using only the standard class library (because of hosting restrictions). I know that it should be relatively easy to read the image header and parse it myself, but it seems that something like this should be already there. Als...