Introduced with Windows Adds support for ICC profiles. Also called DDB, this is the bitmap file format used by Windows 1. It's not really a BMP format. Refer to Windows DDB. For v2, it can range from 30 to The header size can be reduced from its full size of 64 bytes. Omitted fields are assumed to have a value of zero. It has many advanced options image quality, image resize, etc. This freeware works well on All Windows and requires less than 3 Mb of free space on your hard disk.
Using this program, you can convert many hdr-files at once! It's a highly customizable and has many advanced settings image quality option, image resize option. The freeware works well on All Windows. It's fast, lightweight and not eager for your system resources. It has several useful options and image settings, it's lightweight and fast software.
The output image quality allows to specify the desired JPEG quality value. It's a very customizable software and has many advanced options. There are several advanced settings: batch image conversion, image resize, etc. There are several advanced settings such as batch conversion, image resize, etc. The converter is fast, lightweight and easy to use.
Avatar Sizer 1. Business Toolbar Icons PDF Converter Pro Perfect Toolbar Icons Colors include the bit True Color You will get icons in all FaxSee Pro 2.
Perfect City Icons Perfect Mobile Icons Twenty-four-bit bitmap data never uses a color palette nor does it ever need to. The size of the color palette is calculated from the BitsPerPixel value. The color palette has 2, 16, , or 0 entries for a BitsPerPixel of 1, 4, 8, and 24, respectively. BMP Version 2. The file header is also followed by a bitmap header, which is an expanded version of the v1.
This header can vary in size, so the reader must be careful only to read the number of bytes indicated by this value. Fields not included in the Size value are not stored in the BMP file, and their values are assumed to be zero.
For example, if Size is 16, then only the first five fields 16 bytes of the header are present. The color palette will begin starting on the 17th byte. If Size is 40, then only the first eleven fields are present. If this value is 64, then the entire header is present in the file. Compression indicates the type of encoding method used to compress the bitmap data. ImageDataSize is the length of the pixel data in bytes, as stored in the file. XResolution and YResolution are the horizontal and vertical resolutions of the bitmap.
The units used for the values in these fields are defined in the Units field. ColorsUsed is the number of colors present in the palette. If this value is zero and the value of BitsPerPixel is less than 16, then the number of entries is equal to the maximum size possible for the color map. This field is used to provide as accurate a display as possible when using graphics hardware that supports fewer colors than defined in the image. For example, an 8-bit image with colors might only have a dozen or so colors making up the bulk of the image.
If these colors could be identified, a display adapter with only color capability would be able to display the image more accurately using the 16 most frequently occurring colors in the image. The most important colors are always stored first in the palette; ColorsImportant is 0 if all of the colors in the palette are to be considered important. Units indicates the type of units used to interpret the values of the XResolution and YResolution fields.
The only valid value is 0, indicating pixels per meter. Reserved is unused and is always set to a value of zero. Recording specifies how the bitmap scan lines are stored. The only valid value for this field is 0, indicating that the bitmap is stored from left to right and from the bottom up, with the origin being in the lower-left corner of the display. Rendering specifies the halftoning algorithm used on the bitmap data. A value of 0 indicates that no halftoning algorithm was used; 1 indicates error diffusion halftoning; 2 indicates Processing Algorithm for Noncoded Document Acquisition PANDA ; and 3 indicates super-circle halftoning.
Size1 and Size2 are reserved fields used only by the halftoning algorithm. If error diffusion halftoning is used, Size1 is the error damping as a percentage in the range 0 through A value of percent indicates no damping, and a value of 0 percent indicates that any errors are not diffused.
Size2 is not used by error diffusion halftoning. ColorEncoding specifies the color model used to describe the bitmap data.
The only valid value is 0, indicating the RGB encoding scheme. Identifier is a field reserved for application use and may contain an application-specific value. The color palette that may follow the bitmap header is basically the same as the v1. This allows palette entries to be read as 4-byte values, making these values more efficient to read in memory and easier to see in a hex dump or debugger. Reserved pads the structure to end on an even-byte boundary and is always zero.
When identifying BMP files you must make sure that the first two bytes of the file are 4Dh 42h and only read the number of bytes from the bitmap header as indicated by the Size field.
The file header is identical for both versions; the only difference in the bitmap header is that the Width and Height fields are WORDs in v1.
Color Palette As we have seen, a BMP color palette is an array of structures that specify the red, green, and blue intensity values of each color in a display device's color palette. Each pixel in the bitmap data stores a single value used as an index into the color palette. The color information stored in the element at that index specifies the color of that pixel.
One-, 4-, and 8-bit BMP files are expected to always contain a color palette. Twenty-four-bit BMP files never contain color palettes. You must be sure to check the Size field of the bitmap header to know if you are reading 3-byte or 4-byte color palette elements. Larger numbers, such as 64, indicate later versions of BMP, which all use 4-byte color palette elements. In some cases, the newer versions have changed the size of the color palette and added features to the format itself.
Unfortunately, a field wasn't included in the header to easily indicate the version of the file's format or the type of operating system that created the BMP file.
0コメント