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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Tuesday, November 8, 2005 4:33:41 AM(UTC)

nrehman

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Posts: 7

My application displays 4 pages at once of a multi-page TIFF file. I have four viewer controls on my form, but a single RasterImage object. Unfortunately, the RasterImage can only have one active page, so I can't display a different page on each viewer control. Is there a concept of a "Page" object? How can I view multiple pages at the same time of a single RasterImage?


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#2 Posted : Tuesday, November 8, 2005 8:22:25 AM(UTC)

ryoder

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I had the same problem and in order to get around the limitation I created a RasterImage for each page in the original image.

#3 Posted : Tuesday, November 8, 2005 11:57:13 PM(UTC)

Bashar

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This will not work with only one Raster object because - as you said -
a Raster object can have only one active page. You will need to use a Raster object for each viewer.

Bashar Abdulqaiyume
LEAD Technologies, Inc.

#4 Posted : Wednesday, November 9, 2005 5:57:39 AM(UTC)

nrehman

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Posts: 7

Thanks. What would be the most optimal way to take a multi-page RasterImage, and create individual RasterImages for each page? Sample code would be appreciated.

#5 Posted : Thursday, November 10, 2005 3:42:27 AM(UTC)

Bashar

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Code (in VB) would look something like this:

RasterIO.Load RasterObj, "filename", 0, 1, -1
For i = 1 to RasterObj.BitmapListCount - 1
RasterObj.BitmapListIndex = i
RasterIO.Save RasterObj, ..., FILE_OVERWRITE
Next i

#6 Posted : Thursday, November 10, 2005 7:24:35 AM(UTC)

nrehman

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Posts: 7

I am using your .NET version. I don't see those objects/methods. Also, I would like to create the split up RasterImages in memory, and not save to file. (I'm using C#, but VB.NET samples are fine.)

#7 Posted : Sunday, November 13, 2005 1:09:38 AM(UTC)

Bashar

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Call this line to load all the pages to memory:

rasterImage = rasterCodecs.Load(ImageName, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1);

You can access each page using the rasterImage.Page property.

If you want to save each page into a separate memory buffer you can use
the Save method in a loop and save to a stream. Is that what you need?

#8 Posted : Monday, November 14, 2005 11:47:38 AM(UTC)

nrehman

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Posts: 7

I need to keep each page in memory as a separate RasterImage object. I don't need to save to stream just yet. What is the most efficient way to create a new RasterImage object out of the current page? Thanks.

#9 Posted : Wednesday, November 16, 2005 3:21:37 AM(UTC)

Bashar

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Use the clone method, which copies the active page only. Try something like this:

for (int i = 1; i <= rasterImage.PageCount; i++)
{
rasterImage.page = i;
images[i - 1] = rasterImage.Clone();
}

where images is an array of RasterImage references.

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