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Alpha DIBSections
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| Total Hit (2497) |
This article provides an enhanced DIBSection class which allows you to create and draw images with per-pixel alpha. The alpha component of a pixel allows you to determine how transparent you would like a pixel to be. This concept is being increasingly used in the Windows UI to enhance the user exper
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256 Colour DIBSections
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| Total Hit (2233) |
The Image Processing using DIBSections sample provided on this site shows you how to implement a True-Colour DIBSection in VB. This is great for code which needs an effectively unlimited number of colours to perform effectively (such as blurring, sharpening, resampling and so on) but if you are inte
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Scale, Rotate, Skew and Transform Images using GDI+
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| Total Hit (1680) |
GDI+'s image rendering is considerably more powerful than the basic bitmap transfer functions provided under GDI. You can perform high-quality rotation, scaling and skewing with no additional lines of code: and better still the functions run very fast on half decent machines.
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Reading EXIF and Other Image Properties Using GDI+
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| Total Hit (1299) |
Many digital cameras record information about when and how a picture was taken using the EXIF format (which is slowly becoming the DCF format under ISO). You can read and write this information using GDI+; not just that but you can also read the image metadata from TIF and PNG files.
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Reading and Writing JPG, PNG, TIF and GIF Files
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| Total Hit (831) |
This article demonstrates using GDI+ to read and write files in multiple formats (JPEG, PNG, TIF, GIF and BMP files are all supported for reading and writing; you can also read EMG, WMF and ICO files).
Using GDI+ is a great alternative to using the Intel JPEG Library that is now no longer distri
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GDI+ Wrapper
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| Total Hit (2339) |
The GDI+ Wrapper project is a DLL that works on top of Dana Seaman's excellent GDI+ Type Library and aims to provide COM applications with a wrapper providing equivalent functionality to the C++ and .NET GDI+ classes.
The current version provides support for Images and Bitmaps. Further contribut
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CD Track Listing Using freedb.org
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| Total Hit (977) |
This article demonstrates how to use ASPI to read the table of contents from a CD, and then to use FreeDB's CD look-up service to retrieve artist, title and track listing information for the CD. Along the way it describes some of the alternatives and pitfalls.
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Streaming .WAV File Player
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| Total Hit (2133) |
Playing digital audio can be achieved at a number of different levels under windows. At the simplest level, there is the Multimedia Control Interface (MCI) control provided with VB. This is turn is a very thin wrapper around the MCI API provided with Win32, which offers about the same level of contr
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Transparent GDI Sprite Library
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| Total Hit (2092) |
This VB library aims to make it simple to add fast, animated graphics using transparent sprites, something which is either missing or dismally slow using VB's standard methods. The source code provides a complete screen saver, and a simpler (and somewhat smaller) sample which animates a large number
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RunTime Debug Tracing
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| Total Hit (1943) |
Sometimes you want to be able to view trace messages when running your application outside the VB IDE. Perhaps something slightly different happens as an Executable; or you may be running something that's not so easy to debug, such as subclasses, callback procedures and custom COM implementations. W
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A Fast Index-Based Collection
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| Total Hit (1660) |
VB provides a simple Collection for storing objects. However, this object is internally implemented as a hashed linked list, and as such provides good performance for access either by an item's key or through enumeration. If you want to access an object by its index, however, you need to enumerate t
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StringBuilder Class for VB
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| Total Hit (1778) |
If you need to build a string by adding lots of pieces together, VB's string handling is slow because a new string is created in memory every time a new piece is added. This article presents a class which allocates a string chunk and then uses memory copy methods to manipulate the data within the sa
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Dealing with Circular References
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| Total Hit (1609) |
VB and COM makes a lot of things easy to do, particularly using and dealing with objects: you just create them and normally they clear themselves up automatically once you're finished with them. However, one side effect of the way COM works is that it is possible to create objects which cannot termi
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Rank Filters
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| Total Hit (736) |
This is a supporting note describing the Rank filter provided in the vbAccelerator Image Processor. Rank filters can either be linear, yielding a softening effect, or non-linear, giving an impressionistic effects to a images.
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Hue Luminance and Saturation (HLS) Model and Manipulating Colours
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| Total Hit (670) |
Normally in computers colours are described in terms of their Red, Green and Blue components. Whilst you can specify all displayable colours this way, it leaves something to be desired when it comes to picking a colour. For example, most people find it very difficult to determine what RGB values you
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Saving Pictures to JPG Files Using GDI+
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| Total Hit (723) |
Although unfortunately Intel have discontinued support of their IJL library, Microsoft's GDI+ redistributable provides a way for VB coders to work with other file formats fully legitimately; and as a bonus you can also support PNG, TIF and GIF files too. This link redirects you to the new GDI+ file
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Saving Pictures to JPG Files Using the Intel JPEG Library
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| Total Hit (1931) |
Whilst Visual Basic provides support for loading graphic files in various formats into a StdPicture object, it sadly forgets about all of these when it comes to saving the file again. You normally only have one choice of file format for writing: a BMP at the system colour depth.
Whilst there are
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Reading and Writing MP3 ID3v1 and ID3v2 Tags
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| Total Hit (1044) |
This article describes the MP3 ID3v1 and ID3v2 tags and provides a sample application which can read and write both types from MP3 files, along with two reusable classes wrapping up the tag functionality.
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AVI Frame Extractor
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| Total Hit (2817) |
The AVI Frame Extractor code provided here allows you to extract and display individual frames from AVIs. This can be useful if you're trying to create a derivative of an existing AVI as you can extract each of the frames and either edit them in a painting package or write a program to do it. There'
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AVI Creation
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| Total Hit (2550) |
One thing that's always been tricky with AVIs is the lack of suitable software to create them. This article provides VB classes allowing 8-bit and 24-bit AVIs to be created, using any available Codec on the system. The demonstration project uses these classes to provide a pretty comprehensive progra
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Perlin Noise
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| Total Hit (1577) |
Perlin Noise, named after its inventor Ken Perlin, is a widely used texturing primitive in two- and three- dimensional image creation. The Perlin Noise function generates a smoothly interpolated space of pseudo-random values which can be used as the basis for the procedural generation of realistic n
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Totalistic Cellular Automata
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| Total Hit (1686) |
Continuing this short series on the use of cellular automata for creation of algorithmic images, this sample demonstrates using the Totalistic form. A Totalistic cellular automata differs from other the other forms of the algorithm by summing the contribution from surrounding cells, and using modula
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Slow Grow
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| Total Hit (1647) |
This sample models diffusion-limited aggregation and demonstrates that random behaviours can lead to rather less random-looking results with hardly any constraints on the random behaviour.
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Cellular Automata - Catalytic Reactions
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| Total Hit (834) |
This sample shows demonstrates a cellular automata which was initially designed to mimic catalytic reactions and in particular the Belousov-Zhabotinsky or "Clock" reaction. It produces a great variety of continuously varying, wave-like patterns.
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Cellular Automata - Crystal Model
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| Total Hit (1197) |
A cellular automata are a class of mathematical systems which have been used widely in the investigation of complexity. An automaton is simple: an array of neighbouring cells each have a finite number of possible states. Each cell is then set to change its state when an imaginary clock ticks accordi
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Alpha Image Creator
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| Total Hit (2031) |
As described in the Alpha DIBSection article, if you want to draw an image which has per-pixel-alpha using the AlphaBlend call, then you need a bitmap with an alpha channel and R,G,B components which have been pre-multiplied. These bitmaps are hard to come across in the wild, hence this utility to a
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Resampling with Alpha
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| Total Hit (1800) |
If you want to change the size of a bitmap, you quickly find that standard techniques such as GDI's StretchBlt aren't particularly good and the result is usually very pixelated. Resampling is a technique which smooths the contribution of each pixel whilst changing the size, and although it takes mor
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True Colour DIBSection
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| Total Hit (2704) |
This article describes in detail the DIB Section techniques used in the vbAccelerator Image Processor. It describes what DIB Sections are, how to use them and provides True Colour DIBSection class I wrote to wrap up the DIB Section.
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