Hi all,
REALbasic 2007r2 Pro for Mac OS X
Mac OS X 10.4.9
PhotoShop (long time ago) allowed me to display an image using "Points" or
"Pixels".
When the image resolution is 72 dpi (Macintosh - historical - default
resolution), the result was the same (the same image size). But when the image
resolution is - say - 300 dpi, in one case (Points), the image display was
"small" and the other case (Pixels - think "Display all pixels") is larger
(both taller and wider) than the other case. This is the REALbasic standard
behavior.
Using Preview, the default is "display the image as large as the window /
monitor screen allows". But Command-Option-0 display the "true resolution"
(what that old PhotoShop displays as Points). [The menu item name is probably
"Real size").
To be perfectly clear (I hope so), one display mode shows n pixels per Point,
and in the other display mode, every Pixel is displayed (and if the resolution
is higher than the default value, the image can be far greater than the window
screen width and height.
My question is simple:
How can I display the image in the other way (display the image Points instead
of the image Pixels) ?
TIA,
Emile
BTW: in the debugger, a Double is displayed as: "300," (for a 300 dpi value).
And in the OffScreenPict list of properties, the HorizontalResolution and
VerticalResolution values are represented as Integer (the LR states these
values are of type Integer, but some other software I can use sometimes gives
that values as Double...).
PS: I checked in the debugger the OffScreenPict Picture resolutions (V and H)
are 300 dpi. The displayed image takes nearly all the screen width (image
width: 1,200; Monitor width: 1,280): I display every pixels of the image.
For your info, here is the code used to load the image (I pass the dropped
FolderItem to the method in Canvas1.DropObject):
Sub DisplayImage(GraphicFI As FolderItem)
// Global: OffScreenPict As Picture
Dim tmpPict As Picture
Dim grWidth As Integer
Dim grHeight As Integer
Dim grWidthRes As Integer
Dim grHeightRes As Integer
// Load the image in the tmpPict Picture
tmpPict = GraphicFI.OpenAsPicture
If tmpPict = Nil Then
MsgBox "DisplayImage" + EndOfLine + EndOfLine + "tmpPict is Nil"
Return
End If
// Get some Picture properties
grWidth = tmpPict.Width
grHeight = tmpPict.Height
grWidthRes = tmpPict.HorizontalResolution
grHeightRes = tmpPict.VerticalResolution
// Clears the useless object
tmpPict = Nil
// Now create the Picture
OffScreenPict = NewPicture(grWidth,grHeight,32)
If OffScreenPict = Nil Then
MsgBox "DisplayImage" + EndOfLine + EndOfLine + "OffScreenPict is Nil"
Return
End If
// With or without the two following lines produce the same result
OffScreenPict.HorizontalResolution = grWidthRes
OffScreenPict.VerticalResolution = grHeightRes
// Draw the image in the Picture
OffScreenPict = GraphicFI.OpenAsPicture
// Assign the Picture to the canvas
cGraphic.Backdrop = OffScreenPict
// and refresh the canvas contents
cGraphic.Refresh
End Sub
The image used for the test specs are (from Preview):
Document type: JPEG Image
Image Size: 1200 x 730 (Width, Height)
DPI: 300
Color space: Grey
No ColorSync profile
Depth: 8 bits
The used software is Adobe Photoshop CD Windows (the image is a scan I get from
the Internet). It have Exif, JFIF and TIFF properties...
Late breaking news:
-------------------
When I set the OffScreenPict VertricalResolution’ and HorizontalResolution’ to
300, the Picture resolution are set to 300; otherwise they are set - per
default as stated by the LR - to 72 dpi. AND the Width and Height values does
not change.
Resizing the image (using Width / 72 and Height / 72 in the extended
parameters) does not give the same result Preview gave me!
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