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Hue Luminance and Saturation (HLS) Model and Manipulating Colours
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| Total Hit (671) |
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 (1933) |
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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AVI Frame Extractor
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| Total Hit (2819) |
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 (1579) |
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 (1687) |
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 (1649) |
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 (2033) |
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 (1801) |
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 (2707) |
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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Alpha DIBSections
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| Total Hit (2502) |
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 (1685) |
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 (1300) |
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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Transparent GDI Sprite Library
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| Total Hit (2093) |
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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Creating a new GDI Bitmap from a VB Picture or DC
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| Total Hit (3183) |
If you're creating some code which works with VB but draws with the more powerful GDI functions, it's often very handy to be able to create a new bitmap handle from a VB StdPicture object or from an area of a DC. This article demonstrates how to do this with a few lines of GDI code.
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Create a VB Picture from a GDI Picture Handle
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| Total Hit (2681) |
This tip shows you how create a VB Picture object from an GDI bitmap handle (hBitmap). This is useful if you are trying to provide VB users with a picture they can use from a GDI class.
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Blend Two Colours Together Using Alpha
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| Total Hit (1479) |
If you're not using GDI+ for drawing, then there isn't an easy way to determine what colour you would get if you blended two colours together with a specified alpha amount. This article provides a routine that allows you to do it using straight VB code.
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Get an RGB Colour from an OLE_COLOR
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| Total Hit (1519) |
Sometimes you need to know the Red, Green and Blue values of a Visual Basic/COM OLE_COLOR, particularly if you are going to use the colour in an API function. This tip shows you how to correctly convert an OLE_COLOR type to a RGB value using the OleTranslateColor API call exposed by OLEPRO32.DLL. It
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Force an area of a Window to Repaint
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| Total Hit (2161) |
This sample shows how to force an area of a window to repaint. Sometimes this is necessary, particularly when you're experimenting with owner draw control techniques, or when using the LockWindowUpdate API call to improve the speed at which a control fills with data.
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Tutorial : Drawing & Animation
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| Total Hit (1485) |
These tutorials are were originally developed as part of a VB Game Programming for beginners book Soren and I were working on. For a variety of reasons the book idea never came to fruition and so we decided to post the material that is finished as a series of tutorials in the hopes that you would fi
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