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TABLE OF CONTENTS
MPImage.library/--background--
MPImage.library/FreeMPImage
MPImage.library/LoadMPImage
MPImage.library/MPChunkyToPlanar
MPImage.library/MPGreyToPal
MPImage.library/MPImageErrorMessage
MPImage.library/MPPalToGrey
MPImage.library/MPPalToPal
MPImage.library/MPPalToRGB
MPImage.library/MPPlanarToChunky
MPImage.library/MPProgressHook
MPImage.library/MPRGBToGrey
MPImage.library/MPRGBToPal
MPImage.library/MPScaleGrey
MPImage.library/MPScaleRGB
MPImage.library/RescaleMPImage
MPImage.library/SaveMPImageA
MPImage.library/SetMPImageScreen
MPImage.library/--background-- MPImage.library/--background--
MPImage.library lets you load save and process images.
Stuctures/Formats:
RGB Chunky This is held as seperate Red Green and Blue
UBYTE *, with a Width and Height
Grey Chunky This is held as one Grey UBYTE * (often called
red), with a Width and a Height.
Palette This is held as one UBYTE[768] (sometimes called
red, a Width and Height, and a UBYTE *Palette. The
palette holds the red palette in [0] to [255],
the green palette in [256] to [511] and the blue
palette in [512] to [767]. There may also be a
camg (or modeid) and a number of colours, or
number of planes. These are required for EHB and
HAM images.
Bitmap A normal planar bit map. This also has other
fields as for Palette.
EGSBitMap A standard EGSBitMap.
MPImage This holds one of RGB, Grey, Bitmap or EGSBitMap.
MPProcess This holds the RGB pointers and width and height.
It is used for some processing functions.
Image Loading:
LoadMPImage() Loads an image from disc/clipboard.
It loads various formats.
Returns BitMap, RGB, GreyScale or EGSBitMap.
Image Saving:
SaveMPImage() Can save RGB/GreyScale to disc.
It saves in various formats.
ImageScaling:
RescaleMPImage() Scales a loaded image (any format).
Displaying Images
SaveMPImage() Can display RGB/GreyScale Buffers.
Miscellaneous:
FreeMPImage() Frees a loaded image.
SetMPImageScreen() Sets the screen for the progress requester.
MPProgressHook() Sets a progress hook for messages.
MPImageErrorMessage() Returns the last error message.
Planar/Chunky Conversion:
MPPlanarToChunky() Converts a BitMap to a chunky buffer.
MPChunkyToPlanar() Converts a chunky buffer to a BitMap.
SaveMPImage() Can convert RGB Buffers to a BitMap.
Image processing:
Image processing is done on chunky buffers; RGB, GreyScale
or Palette based. The following convert between these formats.
MPGreyToPal() GreyScale to Palette.
MPPalToGrey() Palette to GreyScale.
MPPalToPal() Palette to a different Palette.
MPPalToRGB() Palette to RGB.
MPRGBToGrey() RGB To Grey.
MPRGBToPal() RGB To Palette.
Buffers can also be scaled:
MPScaleGrey() Scales one buffer.
MPScaleRGB() Scales 3 buffers.
Same as 3 calls to MPScaleGrey() but faster.
Summary:
Input Output Format
Format !Disc! RGB !Gray !Palette!BitMap!EGSBitMap!MPImage!Screen
---------!----!-----!-----!-------!------!---------!-------!------
Disc/Clip! !1* !1* ! !1* !1* !1 !
RGB !2 !13,3*!10 !11 !2 ! ! !2
Gray !2 !x !12,3*!6 !2 ! ! !2
Palette ! !9 !7 !8 !5 ! ! !
BitMap ! ! ! !4 !3*,o ! ! !
EGSBitMap! ! ! ! ! !3* ! !
MPImage !2+ !+ !+ !# !+ !+ !3 !2+
1 - LoadMPImage()
2 - SaveMPImage()
3 - RescaleMPImage()
4 - MPPlanarToChunky()
5 - MPChunkyToPlanar()
6 - MPGreyToPal()
7 - MPPalToGrey()
8 - MPPalToPal()
9 - MPPalToRGB()
10 - MPRGBToGrey()
11 - MPRGBToPal()
12 - MPScaleGrey()
13 - MPScaleRGB()
* - As part of an MPImage
+ - Depends on parameters to LoadMPImage
x - Easy - no function supplied
o - See BitMapScale()
# - Depends on LoadMPImage, use 11,6,8 or 4
MPImage.library/FreeMPImage MPImage.library/FreeMPImage
NAME
FreeMPImage -- Free an image loaded using LoadMPImage() (V3)
SYNOPSIS
FreeMPImage( MPi )
A0
void FreeMPImage( struct MPImage * );
FUNCTION
Frees all data associated loaded with an image using LoadMPImage().
INPUTS
MPi - structure returned by LoadMPImage().
RESULT
None.
EXAMPLE
NOTES
BUGS
SEE ALSO
LoadMPImage()
MPImage.library/LoadMPImage MPImage.library/LoadMPImage
NAME
LoadMPImage -- Load an image in various formats (V4)
SYNOPSIS
MPi = LoadMPImage( filename,screen,Flags )
D0 A0 A1 D0
struct MPImage *LoadMPImage
( const char *,struct Screen *,ULONG);
FUNCTION
Load an image in BitMap, EGSBitMap or RGB format.
INPUTS
filename - name of file from which to load image
- -c or -cnumber for clipboard
screen - screen on which BitMap is to be used. May be NULL.
Flags - Flags to control image loading
Default is to remap to screen palette and return a bitmap in BitMap
Only way to free is to call FreeMPImage().
MPIF_EGS - Return E_EBitMap rather than BitMap.
Overrides MPIF_RGB
MPIF_CLONEBITMAP - You are free to zero BitMap/EGS_BitMap before
calling FreeMPImage(). You must then call FreeBitMap() or
E_DisposeBitMap() yourself. Ignored for MPIF_RGB/GREY. If screen
supplied then clone is screen depth deep if possible.
MPIF_NOREMAP - Don't remap to the current screen colors. Ignored
for MPIF_EGS/RGB/GREY. Returns error if 24 bit input.
MPIF_RGB - return Red, Green, Blue instead of BitMap.
MPIF_GREY - return Red, Green, Blue instead of BitMap. If
image is greyscale then Red, Green and Blue will be the same
and GreyScale will be TRUE
MPIF_FORCEGREY - As MPIF_GREY except input will always be remapped
to greyscale.
MPIF_LINEARGREY - Use linear (not colour based) mapping (V5.0)
RESULT
MPi - Pointer to an MPImage structure holding the image data.
NULL if an error occurs. Use MPImageErrorMessage() to get error.
EXAMPLE
NOTES
If file format is JPG and env/mpimage/djpeg is set (e.g. djpeg "%s" "%s")
and not loading a BitMap then djpeg is used.
If file format is PNG and env/mpimage/pngtopnm is set
(e.g. pngtopnm "%s" >"%s") and not loading a BitMap then pngtopnm is used.
Other fileformats are IBLM (depth 1 to 8 and 24, EHB, HAM6 and HAM8),
PBM (all types) and any picture datatype. With dctv.library(3) can also
load DCTV images.
BUGS
Waits 20 seconds for djpeg/pngtopnm to start then aborts.
Fails to set an error message if failure loading from clipboard.
Can also fail to set an error message in other (unknown) circumstances.
SEE ALSO
FreeMPImage(),MPImageErrorMessage,graphics.library/FreeBitMap(),
egs.library/E_DisposeBitMap(),MPImageErrorMessage().
MPImage.library/MPChunkyToPlanar MPImage.library/MPChunkyToPlanar
NAME
MPChunkyToPlanar -- Convert a chunky buffer to a BitMap (V7)
SYNOPSIS
MPChunkyToPlanar( chunky, bitmap, width, height )
A0 A1 D0 D1
void MPPlanarToChunky( UBYTE *, struct BitMap *, UWORD, UWORD);
FUNCTION
Converts a chunky buffer to a BitMap.
INPUTS
chunky - Pointer to a chunky buffer of sufficient size.
bitmap - Pointer to a standard bitmap (of sufficient size).
width - Width of buffer.
height - Height of buffer.
RESULT
None.
EXAMPLE
NOTES
BUGS
SEE ALSO
MPPlanarToChunky().
MPImage.library/MPGreyToPal MPImage.library/MPGreyToPal
NAME
MPGreyToPal -- Convert GreyScale image to a palette (V7)
SYNOPSIS
MPGreyToPal( MPp,maxcol,pal )
A0 D0 A1
void MPGreyToPal
( struct MPProcess *,ULONG,UBYTE *,BOOL);
FUNCTION
Convert Grey to a palette.
INPUTS
MPp - Contains (in Read) the GreyScale chunky pixels
and the Width and Height
maxcol - The number of colours in the palette.
pal - The palette. This is a 768 byte array.
r[0] to r[maxcol] hold the Red palette
r[256] to r[256+maxcol] hold the Green palette
r[512] to r[512+maxcol] hold the Blue palette
RESULT
The data pointed to by MPp->Red is updated to the palette mapped image.
EXAMPLE
NOTES
BUGS
Not tested.
SEE ALSO
MPRGBToPal().
MPImage.library/MPImageErrorMessage MPImage.library/MPImageErrorMessage
NAME
MPImageErrorMessage -- Return the last error set by MPImage.library. (V3)
SYNOPSIS
msg = MPImageErrorMessage()
D0
char *MPImageErrorMessage( void );
FUNCTION
Returns the last error message set by this opener of MPImage.library.
INPUTS
None.
RESULT
Formatted Error Message.
EXAMPLE
NOTES
BUGS
SEE ALSO
MPImage.library/MPPalToGrey MPImage.library/MPPalToGrey
NAME
MPPalToGrey -- Convert palette image to GreyScale (V7)
SYNOPSIS
MPPalToGrey(Width,Height,pal,chunky,nPlanes,camg,Linear);
D0 D1 A0 A1 D2 D3 D4
void MPPalToGrey
(UWORD,UWORD,UBYTE *,UBYTE *,UWORD,ULONG,BOOL);
FUNCTION
Convert palette image to GreyScale.
INPUTS
Width - Width of image.
Height - Height of image.
pal - The current palette. This is a 768 byte array.
[0] to [...] hold the Red palette
[256] to [256+...] hold the Green palette
[512] to [512+...] hold the Blue palette
chunky - The current chunky pixels.
nPlanes - The number of planes in the current palette.
camg - The camg of the current palette.
Linear - If True then map linear,
otherwise give more weight to Green.
RESULT
The data pointed to by chunky is updated to the GreyScale pixels.
EXAMPLE
NOTES
nPlanes and camg are required to cater for EHB and HAM.
BUGS
Not tested.
SEE ALSO
MPPalToRGB().
MPImage.library/MPPalToPal MPImage.library/MPPalToPal
NAME
MPPalToPal -- Convert image with one palette to another palette (V7)
SYNOPSIS
MPPalToPal(OldPal,OldCols,NewPal,NewCols,chunky,Width,Height,
nPlanes,camg);
A0 D0 A1 D1 A2 D2 D3
D4 D5
void MPPalToPal
( UBYTE *,ULONG,UBYTE *,ULONG,UBYTE *,UWORD,UWORD,
UWORD, ULONG);
FUNCTION
Convert image with one palette to another palette.
INPUTS
OldPal - The current palette. This is a 768 byte array.
[0] to [maxcol] hold the Red palette
[256] to [256+maxcol] hold the Green palette
[512] to [512+maxcol] hold the Blue palette
OldCols - The number of colours in the current palette.
NewPal - The new palette. This is a 768 byte array.
[0] to [maxcol] hold the Red palette
[256] to [256+maxcol] hold the Green palette
[512] to [512+maxcol] hold the Blue palette
NewCols - The number of colours in the new palette.
chunky - The chunky pixels.
Width - The width of the image.
Height - The height of the image.
nPlanes - The number of planes in the current palette
camg - The camg of the current palette
RESULT
The data pointed to by chunky is updated to the new palette.
EXAMPLE
NOTES
nPlanes and camg are required to cater for EHB and HAM.
BUGS
Not tested.
SEE ALSO
MPImage.library/MPPalToRGB MPImage.library/MPPalToRGB
NAME
MPPalToRGB -- Convert palette image to RGB (V7)
SYNOPSIS
MPPalToRGB(MPp,pal,chunky,nPlanes,camg);
A0 A1 A2 D0 D1
void MPPalToRGB
( struct MPProcess *,UBYTE *,UBYTE *,UWORD,ULONG);
FUNCTION
Convert palette image to RGB.
INPUTS
MPp - Holds buffers to store the Red, Green and Blue pixels
and the Width and the Height.
pal - The current palette. This is a 768 byte array.
[0] to [...] hold the Red palette
[256] to [256+...] hold the Green palette
[512] to [512+...] hold the Blue palette
chunky - The current chunky pixels.
nPlanes - The number of planes in the current palette
camg - The camg of the current palette
RESULT
The data pointed to by MPp->Red, MPp->Green and MPp->Blue are updated
to the RGB pixels.
EXAMPLE
NOTES
nPlanes and camg are required to cater for EHB and HAM.
BUGS
Not tested.
SEE ALSO
MPPalToGrey().
MPImage.library/MPPlanarToChunky MPImage.library/MPPlanarToChunky
NAME
MPPlanarToChunky -- Convert a bitmap to a chunky buffer (V5)
SYNOPSIS
MPPlanarToChunky( bitmap, chunky, width, height )
A0 A1 D0 D1
void MPPlanarToChunky( struct BitMap *, UBYTE *, UWORD, UWORD);
FUNCTION
Converts a BitMap to a chunky buffer.
INPUTS
bitmap - Pointer to a standard bitmap.
chunky - Pointer to a chunky buffer of sufficient size.
width - Width of bitmap.
height - Height of bitmap.
RESULT
None.
EXAMPLE
NOTES
BUGS
SEE ALSO
MPChunkyToPlanar().
MPImage.library/MPProgressHook MPImage.library/MPProgressHook
NAME
MPProgressHook -- Sets the Progress Hook (V6)
SYNOPSIS
MPProgressHook(Hook)
A0
void MPProgressHook(struct Hook*);
FUNCTION
Sets the Hook to call for progress messages.
INPUTS
Hook - Hook to call
RESULT
None.
EXAMPLE
NOTES
Called with...
object = MPIP_MAX, (ULONG)message = max-progress
object = MPIP_MAX, (ULONG)message = curr-progress
object = MPIP_CURR,(UBYTE *)message = Progress-Message
BUGS
SEE ALSO
MPImage.library/MPRGBToGrey MPImage.library/MPRGBToGrey
NAME
MPRGBToGrey -- Convert RGB image to GreyScale (V7)
SYNOPSIS
MPRGBToGrey(MPp,Linear);
A0 D0
void MPRGBToGrey
(struct MPProcess *,BOOL);
FUNCTION
Convert RGB image to GreyScale.
INPUTS
MPp - Contains the Red,Green and Blue chunky pixels
and the Width and Height
Linear - If True then map linear,
otherwise give more weight to Green.
RESULT
The data pointed to by MPp->Red is updated to the GreyScale pixels.
EXAMPLE
NOTES
BUGS
Not tested.
SEE ALSO
MPImage.library/MPRGBToPal MPImage.library/MPRGBToPal
NAME
MPRGBToPal -- Convert RGB image to a palette (V7)
SYNOPSIS
MPRGBToPal( MPp,maxcol,pal,bit12 )
A0 D0 A1 D1
void MPRGBToPal
( struct MPProcess *,ULONG,UBYTE *,BOOL);
FUNCTION
Convert RGB to a palette.
INPUTS
MPp - Contains the Red,Green and Blue chunky pixels
and the Width and Height
maxcol - The number of colours in the palette.
pal - The palette. This is a 768 byte array.
pal[0] to pal[maxcol] hold the Red palette
pal[256] to pal[256+maxcol] hold the Green palette
pal[512] to pal[512+maxcol] hold the Blue palette
bit12 - If set then only the top 4 bits of the palette
are used and the mapping is far quicker.
RESULT
The data pointed to by MPp->Red is updated to the palette mapped image.
EXAMPLE
NOTES
If there is insufficient memory then bit12 is treated as false.
BUGS
Not tested.
SEE ALSO
MPGreyToPal().
MPImage.library/MPScaleGrey MPImage.library/MPScaleGrey
NAME
MPScaleGrey -- Scales a GreyScale image (V7)
SYNOPSIS
MPScaleGrey( Old,New,OWidth,OHeight,NWidth,NHeight,Temp)
A0 A1 D0 D1 D2 D3 A2
void MPScaleGrey
( UBYTE *,UBYTE *,UWORD,UWORD,UWORD,UWORD,UBYTE *);
FUNCTION
Scales an RGB image.
INPUTS
Old - Contains existing chunky pixels.
New - Buffer for the new chunky pixels.
OWidth - Current Width.
OHeight - Current Height.
NWidth - New Width.
NHeight - New Height.
Temp - Temporary buffer sized for the new image.
RESULT
The data pointed to by New is updated to the scaled image.
EXAMPLE
NOTES
BUGS
Not tested.
SEE ALSO
MPScaleRGB().
MPImage.library/MPScaleRGB MPImage.library/MPScaleRGB
NAME
MPScaleRGB -- Scales an RGB image (V7)
SYNOPSIS
MPScaleRGB( Old,New,Temp)
A0 A1 A2
void MPScaleRGB
( struct MPProcess *,struct MPProcess *,struct MPProcess *);
FUNCTION
Scales an RGB image.
INPUTS
Old - Contains the Red,Green and Blue chunky pixels
and the Width and Height of the current image.
New - Contains the Red,Green and Blue chunky pixels
and the Width and Height for the new image.
Temp - Contains 3 temporary buffers sized for the new image.
RESULT
The data pointed to by New->Red/Green/Blue is updated to
the scaled image.
EXAMPLE
NOTES
BUGS
Not tested.
SEE ALSO
MPScaleGrey().
MPImage.library/RescaleMPImage MPImage.library/RescaleMPImage
NAME
RescaleMPImage -- Scales an image created by LoadMPImage() (V3)
SYNOPSIS
error = RescaleMPImage(MPi, x, y)
D0 A0 D0 D1
BOOL RescaleMPImage(struct MPImage *, UWORD, UWORD);
FUNCTION
Scales an Image loaded by LoadMPImage() to new width and height.
INPUTS
MPi - Image loaded by LoadMPImage
x - New width of image
y - New height of image
RESULT
error - 1 for success, 0 for failure.
Use MPImageErrorMessage() to get error.
EXAMPLE
NOTES
Rescaling of bitmaps is done using BitMapScale().
Other rescaling is done using custom code with smoothing.
If this function fails then the MPImage is no longer usable and
FreeMPImage() should be called to free it.
Version 4.3 is faster for RGB.
BUGS
Bitmaps may not scale smoothly.
The rescaling of EGS images is not efficent.
SEE ALSO
LoadMPImage(),MPImageErrorMessage(),FreeMPImage(),
graphics.library/BitMapScale().
MPImage.library/SaveMPImageA MPImage.library/SaveMPImageA
NAME
SaveMPImageA -- Save an image in various formats. (V3)
SaveMPIMage -- Varargs version of SaveMPImageA (V3)
SYNOPSIS
succ = SaveMPImageA( file,red,green,blue,width,height,taglist)
D0 A0 A1 A2 A3 D0 D1 A5
BOOL SaveMPImageA( UBYTE *,UBYTE *,UBYTE *,UBYTE *,
UWORD,UWORD,struct TagItem *);
succ = SaveMPImage( file,red,green,blue,width,height,Tag1, ...)
BOOL SaveMPImage( UBYTE *,UBYTE *,UBYTE *,UBYTE *,
UWORD,UWORD,ULONG,...);
FUNCTION
Saves/displays an image held in chunky buffers.
INPUTS
file - filename to save file as. If NULL or "" then image is
displayed on a custom screen, or returned in BitMap (V7.0)
red - red chunky input.
green - green chunky input.
blue - blue chunky input.
width - width of chunky buffers
height - height of chunky buffers.
taglist - pointer to TagItem array.
Tags are:
MPIS_MODE - Data is ULONG CAMG of output IFF file/screen EHB and HAM
will be added if required. If not supplied then
MPIS_MODENAME will be used. If that is not supplied then
a CAMG mode will be generated.
MPIS_MODENAME - Data is char * mode name of CAMG of output. Invalid
names are ignored.
MPIS_FORMAT - Data is char * specifying output format.
Default is MPI_BW16. Values are:
MPI_BW16 - "BW16" - 16 colour ILBM grey scale.
MPI_BW256 - "BW256" - 256 colour ILBM grey scale.
MPI_HAM6 - "HAM6" - HAM6 with fixed (internal) palette.
MPI_HAM6P - "HAM6P" - HAM6 with generated or supplied
palette - see MPIS_PALETTE.
MPI_HAM8 - "HAM8" - HAM8 with fixed (internal) palette.
MPI_HAM8P - "HAM8P" - HAM8 with generated or supplied
palette - see MPIS_PALETTE.
MPI_ILBM24 - "ILBM24" - 24 bit ILBM.
MPI_PPM - "PPM" - P6 (or P5 if red,green and blue are
the same).
MPI_COLOUR - "COLOUR" - ILBM with generated or supplied
palette - see MPIS_PALETTE.
MPI_EHB - "EHB" - EHB with generated or supplied
palette - see MPIS_PALETTE.
MPI_JPEG - "JPEG" - JPEG see NOTES.
MPI_PNM - "PNG" - PNG see NOTES.
MPI_DCTV3 - "DCTV3" - DCTV 3 bit plane format
MPI_DCTV4 - "DCTV4" - DCTV 4 bit plane format
MPIS_PALETTE - Data is char * name of ILBM to load palette from.
MPIS_COLOURS - Data is ULONG number of colours for MPI_COLOUR.
Default is is number of colours in MPIS_PALETTE if
supplied, otherwise 16. If greater than that from
MPIS_PALETTE then ignored.
MPIS_12BIT - Data is BOOL. If TRUE then use faster 12bit colour palette
generating algorithm for MPI_COLOUR and MPI_EHB. Default
is FALSE to use 18bit algorithm.
MPIS_LINEAR - Data is BOOL. If TRUE then for BW16/BW256 use linear
(not colour based) mapping. (V5.0)
MPIS_GREYMAP - Data is UBYTE *. For BW16/BW256 palette map. Must point
to at least 16 of value 0 to 15 for BW16, 256 bytes of
0 to 255 for BW255. (V5.0)
Format is e.g. 0,2,3,4,5,6,7,8,9,10,11,12,13,14,15,1
Colour 0 will be black
Colour 1 will be white
etc.
This is the opposite to which you may expect!
MPIS_OLDPALETTE - Palette to use (for HAMxP/COLOUR/EHB) (V7.0)
Data is UBYTE *, red in [0] to [255],
green in [256] to [511]
blue in [512] to [767]
MPIS_NEWPALETTE - Palette used (for HAMx/COLOUR/EHB) (V7.0)
Data is UBYTE * (see MPIS_OLDPALETTE).
MPIS_BITMAP - BitMap to update (for BWxx/HAMxx/COLOUR/EHB/DCTVx) (V7.0)
Data is struct BitMap *
Image is not displayed/saved
RESULT
error - 1 for success, 0 for failure.
Use MPImageErrorMessage() to get error.
EXAMPLE
NOTES
If MPIS_FORMAT is BW16 or BW256 and red,green and blue are the same then
a more efficent algorithm is used.
When displaying on screen click in the top left and press a key to exit.
If file format is JPEG and env/mpimage/cjpeg is set (e.g. cjpeg "%s" "%s")
then cjpeg is used.
If file format is PNG and env/mpimage/pnmtopng is set
(e.g. 'pnmtopng "%s" >"%s"') then pnmtopng is used.
BUGS
Does not work for images > 1024 wide (except PPM/JPEG/PNG).
The palette file requires a body which is loaded and then discarded.
Waits 20 seconds for cjpeg/pnmtopng to start then aborts. This check is
not fool proof and the PIPE:xxx can be left hanging.
Prior to version 4.3 fails to determine a screen mode correctly.
V7.0 did not handle MPIS_BITMAP correctly.
SEE ALSO
MPImageErrorMessage().
MPImage.library/SetMPImageScreen MPImage.library/SetMPImageScreen
NAME
SetMPImageScreen -- Sets the Screen name for progress requesters (V3)
SYNOPSIS
SetMPImageScreen(ScreenName,Flags)
A0 D0
void SetMPImageScreen(char *, ULONG);
FUNCTION
Sets the Screen Name for progress requesters for this opener.
INPUTS
ScreenName - Name of Public Screen, NULL for default
Flags - 0 - Do not show progress requesters (default)
- MPIF_PROGRESS - Do show progress requesters
(except for non remapped bitmaps).
RESULT
None.
EXAMPLE
NOTES
ScreenName must remain valid while MPImage.library is open.
BUGS
SEE ALSO