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- Correspondence between tags and constants
- Managing errors
ImageInfoValue (Function) In french: ImageInfoValeur Returns the value of an Exif tag for the image used. Remark: The Exif (EXchangeable Image File) information is included in the image file. This standard defines a set of tags used to store information about the image: date, width, orientation, camera model, shutter speed, distance, exposure time, ...
TagList is string
MyTag is int
i is int = 1
// Retrieve the available tags for
// the JPEG image displayed in the "IMG_MyImageControl" control
TagList = ImageInfoList(IMG_MyImageControl)
WHILE ExtractString(TagList, i, CR) <> EOT
// Retrieve each tag
MyTag = ExtractString(TagList, i, CR)
// Add the tag and its value into TABLE_MyTable
TableAddLine(TABLE_MyTable, MyTag, ...
ImageInfoValue(IMG_MyImageControl, MyTag))
i ++
END
ImgPath is string = "C:\My Images\MyImage.JPG"
// Find out the creation date of this image
Info("Creation date: " + ImageInfoValue(ImgPath, imgDate) + CR + ...
"Lightness: " + ImageInfoValue(ImgPath, imgBrightness) + CR + ...
"Focal length: " + ImageInfoValue(ImgPath, imgFocalLength) + CR + ...
"Aperture: " + ImageInfoValue(ImgPath, imgAperture))
// Close the image file
ImageInfoClose(ImgPath)
Syntax
<Result> = ImageInfoValue(<Image> , <Tag>)
<Result>: Buffer Value of the specified tag for the image used. <Image>: Character string (with or without quotes) Image to use. This image can correspond to:- an image file (JPEG or TIFF format): specify the name and the full (or relative) path of the file. A UNC path can be used.
In this case, the file must be closed by ImageInfoClose. - an image (JPEG or TIFF format) displayed in an Image control: specify the name of the Image control.
- an image (JPEG or TIFF format) found in an image memo: specify this image memo.
- an image (JPEG or TIFF format) found in a binary string: specify this binary string.
<Tag>: Constant or integer Tag whose value is requested. This tag can correspond to:- an integer given by ImageInfoList.
- a WLanguage constant. See "Correspondence between tags and constants" for more details.
Remarks Correspondence between tags and constants The table below presents the correspondence between tags and WLanguage constants. | | | | Tag | WLanguage constant | Value |
|---|
| 37510 | imgComment | Character string
Comments about the image | | 37122 | imgCompression | Real
Compression of the image in bits/pixel | | 33432 | imgCopyright | Character string
Copyright of the image | | 306 | imgDate | Date
Date and time of the image in YYYY:MM:DD HH:MM:SS format | | 270 | imgDescription | Character string
Image description | | 37382 | imgSubjectDistance | Real
Distance from the subject in meters | | 37380 | imgExposureBias | Real
Exposure bias in APEX | | 37385 | imgFlash | Integer
Status of the flash during the shot:- 0: Flash off.
- 1: Flash on.
- 5: Flash on and light not detected.
- 7: Flash on and light detected.
| | 928 | imgHeight | Integer
Height of image in pixels | | 672 | imgWidth | Integer
Width of image in pixels | | 305 | imgRecordingSoftware | Character string
Name of the software that was used to record the image. | | 37386 | imgFocalLength | Real
Focal length in millimeters | | 37379 | imgBrightness | Real
Brightness of the image in APEX | | 271 | imgDeviceMark | Character string
Mark of the camera that took the photo | | 272 | imgDeviceModel | Character string
Model of camera that took the photo | | 37383 | imgMeteringMode | Integer
Metering mode:- 0: unknown.
- 1: average.
- 2: average centered.
- 3: point.
- 4: multipoint.
- 5: pattern.
- 6: partial.
- 7 to 254: reserved.
- 255: other.
| | 37500 | imgManufacturerNote | Character string
Name of the camera manufacturer | | 274 | imgOrientation | Integer
Orientation of the image:
This information indicates the location of the point (0,0) in the image.
To display the image in the correct direction based on this information, use the following values:- 1: the point (0,0) is at the top left, there is nothing to do.
- 2: the point (0,0) is at the top right, the image must be flipped horizontally.
- 3: the point (0,0) is at the bottom right, the image must be flipped horizontally and vertically.
- 4: the point (0,0) is at the bottom left, the image must be flipped horizontally.
- 5: the point (0,0) is at the top left, the image must be flipped horizontally and rotated 90°.
- 6: the point (0,0) is at the top right, the image must be rotated 90°.
- 7: the point (0,0) is at the bottom left, the image must be flipped vertically and rotated 90°.
- 8: the point (0,0) is at the bottom right, the image must be rotated -90°.
| | 37378 | imgAperture | Real
Aperture in APEX | | 33437 | imgFAperture | Real
Focal | | 37381 | imgMaxAperture | Real
Maximum aperture in APEX | | 34850 | imgExposureProgram | Integer
Exposure mode used during the shot:- 0: undefined.
- 1: manual.
- 2: normal.
- 3: priority to aperture.
- 4: priority to speed.
- 5: creation.
- 6: action.
- 7: portrait with no background.
- 8: landscape.
- 9 to 255: others.
| | 282 | imgXResolution | Real
Horizontal resolution of the image | | 283 | imgYResolution | Real
Vertical resolution of the image | | 37384 | imgLightSource | Integer
Light source for the image:- 0: unknown.
- 1: daylight.
- 2: fluorescent.
- 3: tungsten.
- 17: standard light A.
- 18: standard light B.
- 19: standard light C.
- 20: D55.
- 21: D65.
- 22: D75.
- 23 to 254: reserved.
- 255: other.
| | 33434 | imgExposureTime | Real
Exposure time | | 296 | imgResolutionUnit | Integer
Unit for the horizontal and vertical resolution of the image: - 2: inches.
- 3: centimeters.
| | 36864 | imgEXIFVersion | Character string
Version of Exif information | | 65536 | imgThumbnail | Binary string
Thumbnail corresponding to the image | | 37377 | imgShutterSpeed | Real
Shutter speed in APEX |
Other tags are also available. These unlisted tags are specific to some types of cameras or correspond to custom tags. ImageInfoValue returns no error code. To find out whether an error was generated by this function, use the ErrorOccurred variable. To find out the error details, use ErrorInfo.
Related Examples:
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Unit examples (WINDEV): The EXIF functions
[ + ] Using the ImageXXX functions. These functions are used to access the EXIF information of an image. The EXIF information is included in the JPEG or TIFF images. It can be for example the snapshot date, the orientation of the device when taking the photo, the make and model of the camera, a miniature of the image...
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