PNMImageHeader¶
from panda3d.core import PNMImageHeader
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class
PNMImageHeader
¶ This is the base class of
PNMImage
, PNMReader, and PNMWriter. It encapsulates all the information associated with an image that describes its size, number of channels, etc; that is, all the information about the image except the image data itself. It’s the sort of information you typically read from the image file’s header.Inheritance diagram
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enum
ColorType
¶ This enumerated type indicates the number of channels in the image, and also implies an image type. You can treat it either as an integer number of channels or as an enumerated image type.
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enumerator
CT_invalid
= 0¶
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enumerator
CT_grayscale
= 1¶
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enumerator
CT_two_channel
= 2¶
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enumerator
CT_color
= 3¶
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enumerator
CT_four_channel
= 4¶
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enumerator
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class
HistMap
¶ alias of
map_PixelSpec_int
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class
Histogram
¶ Used to return a pixel histogram in PNMImage::get_histogram().
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__init__
()¶
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__init__
(param0: Histogram)
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getCount
(pixel: PixelSpec) → int¶ Returns the number of occurrences in the image of the indicated pixel color.
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getCount
(n: int) → int Returns the number of occurrences in the image of the nth unique pixel color in the histogram.
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class
Palette
¶ alias of
pvector_PixelSpec
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class
PixelCount
¶ alias of
pvector_PixelSpecCount
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class
PixelSpec
¶ Contains a single pixel specification used in compute_histogram() and make_histogram(). Note that pixels are stored by integer value, not by floating-point scaled value.
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__init__
(param0: PixelSpec)¶
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__init__
(rgb: xel)
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__init__
(gray_value: int)
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class
PixelSpecCount
¶ Associates a pixel specification with an appearance count, for use in Histogram, below.
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__init__
(param0: PixelSpecCount)¶
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__init__
()¶
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__init__
(copy: PNMImageHeader)
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assign
(copy: PNMImageHeader) → PNMImageHeader¶
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property
color_space
→ ColorSpace¶ Returns the color space that the image is encoded in, or CS_unspecified if unknown.
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property
comment
→ string¶ - Getter
Gets the user comment from the file.
- Setter
Writes a user comment string to the image (header).
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getColorSpace
() → ColorSpace¶ Returns the color space that the image is encoded in, or CS_unspecified if unknown.
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getColorType
() → ColorType¶ Returns the image type of the image, as an enumerated value. This is really just the number of channels cast to the enumerated type.
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getMaxval
() → int¶ Returns the maximum channel value allowable for any pixel in this image; for instance, 255 for a typical 8-bit-per-channel image. A pixel with this value is full on.
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getSize
() → LVecBase2i¶ Returns the number of pixels in each direction. This is one more than the largest allowable coordinates.
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getType
() → PNMFileType¶ If the file type is known (e.g.
hasType()
returns true), returns itsPNMFileType
pointer; otherwise, returns NULL.
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getXSize
() → int¶ Returns the number of pixels in the X direction. This is one more than the largest allowable X coordinate.
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getYSize
() → int¶ Returns the number of pixels in the Y direction. This is one more than the largest allowable Y coordinate.
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hasAlpha
() → bool¶ Returns true if the image includes an alpha channel, false otherwise. Unlike
isGrayscale()
, if this returns false it is an error to call any of the functions accessing the alpha channel.
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hasAlpha
(color_type: ColorType) → bool This static variant of
hasAlpha()
returns true if the indicated image type includes an alpha channel, false otherwise.
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hasType
() → bool¶ Returns true if the
PNMImageHeader
knows what type it is, false otherwise.
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isGrayscale
() → bool¶ Returns false if the image is a full-color image, and has red, green, and blue components; true if it is a grayscale image and has only a gray component. (The gray color is actually stored in the blue channel, and the red and green channels are ignored.)
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isGrayscale
(color_type: ColorType) → bool This static variant of
isGrayscale()
returns true if the indicated image type represents a grayscale image, false otherwise.
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makeReader
(filename: Filename, type: PNMFileType, report_unknown_type: bool) → PNMReader¶ Returns a newly-allocated PNMReader of the suitable type for reading from the indicated image filename, or NULL if the filename cannot be read for some reason. The filename “-” always stands for standard input. If type is specified, it is a suggestion for the file type to use.
The PNMReader should be deleted when it is no longer needed.
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makeReader
(file: istream, owns_file: bool, filename: Filename, magic_number: str, type: PNMFileType, report_unknown_type: bool) → PNMReader Returns a newly-allocated PNMReader of the suitable type for reading from the already-opened image file, or NULL if the file cannot be read for some reason.
owns_file should be set true if the PNMReader is to be considered the owner of the stream pointer (in which case the stream will be deleted on completion, whether successful or not), or false if it should not delete it.
The filename parameter is optional here, since the file has already been opened; it is only used to examine the extension and attempt to guess the file type.
If magic_number is nonempty, it is assumed to represent the first few bytes that have already been read from the file. Some file types may have difficulty if this is more than two bytes.
If type is non-NULL, it is a suggestion for the file type to use.
The PNMReader should be deleted when it is no longer needed.
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makeWriter
(filename: Filename, type: PNMFileType) → PNMWriter¶ Returns a newly-allocated PNMWriter of the suitable type for writing an image to the indicated filename, or NULL if the filename cannot be written for some reason. The filename “-” always stands for standard output. If type is specified, it is a suggestion for the file type to use.
The PNMWriter should be deleted when it is no longer needed.
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makeWriter
(file: ostream, owns_file: bool, filename: Filename, type: PNMFileType) → PNMWriter Returns a newly-allocated PNMWriter of the suitable type for writing to the already-opened image file, or NULL if the file cannot be written for some reason.
owns_file should be set true if the PNMWriter is to be considered the owner of the stream pointer (in which case the stream will be deleted on completion, whether successful or not), or false if it should not delete it.
The filename parameter is optional here, since the file has already been opened; it is only used to examine the extension and attempt to guess the intended file type.
If type is non-NULL, it is a suggestion for the file type to use.
The PNMWriter should be deleted when it is no longer needed.
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property
maxval
→ int¶ Returns the maximum channel value allowable for any pixel in this image; for instance, 255 for a typical 8-bit-per-channel image. A pixel with this value is full on.
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readHeader
(filename: Filename, type: PNMFileType, report_unknown_type: bool) → bool¶ Opens up the image file and tries to read its header information to determine its size, number of channels, etc. If successful, updates the header information and returns true; otherwise, returns false.
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readHeader
(data: istream, filename: str, type: PNMFileType, report_unknown_type: bool) → bool Reads the image header information only from the indicated stream.
The filename is advisory only, and may be used to suggest a type if it has a known extension.
If type is non-NULL, it is a suggestion for the type of file it is (and a non-NULL type will override any magic number test or filename extension lookup).
Returns true if successful, false on error.
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setType
(type: PNMFileType) → None¶ Sets the file type of this
PNMImage
. This will be the default type used when an image is read, if the type cannot be determined by magic number or inferred by extension, or the type used when the image is written, if the type cannot be inferred from the filename extension.
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property
size
→ LVecBase2i¶ Returns the number of pixels in each direction. This is one more than the largest allowable coordinates.
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property
type
→ PNMFileType¶ If the file type is known (e.g.
hasType()
returns true), returns itsPNMFileType
pointer; otherwise, returns NULL.
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enum