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POPreserving Bitmap values when creating a new Bitmap from System.Drawing.Image
 

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    <p>I'm trying to create a resized image from a bitmap, set a new height/width and a new resolution and save it to PNG. I can do this either from directly A) <code>Image.FromFile(filename)</code> or B) <code>New Bitmap(imageSource)</code> to create the the <strong><em>A</em></strong> Bitmap to be passed to <strong><em>B</em></strong>. Both work okay schmokay, but <strong><em>A</em></strong> does not allow me to set a new width/height on creation (but it does allow me to preserve values with <code>useIcm=True</code>) and <strong><em>B</em></strong> does not allow me to preseve values.</p> <p>Okay, now on to some code and examples:</p> <ol> <li><p><code>Dim sourceBitmap As New Bitmap(imagePath &amp; myImage1Name)</code> &lt;-not good at all (#1 overload). Doesn't preserve things like <code>HorizontalResolution</code> or <code>PixelFormat</code> on <code>.Save</code></p></li> <li><p><code>Dim sourceBitmap2 As Bitmap = Image.FromFile(imagePath &amp; myImage1Name, True)</code> &lt;-not good (#5 overload). it <em>does</em> preserve things like <code>HorizontalResolution</code> or <code>PixelFormat</code> on <code>.Save</code>, but it <strong><em>doesn't</em></strong> allow me to initialize image at a new size.</p></li> <li><code>Dim targetBitmap As New Bitmap(sourceBitmap2, newWidth, newHeight)</code> &lt;-not good. Even though <code>sourceBitmap2</code> (see #2 above) was initialized with <code>useIcm=True</code>, it doesn't matter once I've passed it in as the source in <code>targetBitmap</code>.</li> </ol> <p>Basically, I'm looking for a way to contruct a New Bitmap with both something like <code>useIcm=True</code> <em>and</em> set the width/height at the same time (<code>Width</code>/<code>Height</code> are read-only properties once it's created).</p> <p>I've gone down the <code>Graphics.DrawImage</code> route as well and it's the same - <code>Graphics.FromImage(sourceBitmap)</code> does not preserve values.</p> <p>Why do I need these values to be preserved? Because I need to convert these pictures to PNG (for file size) with a new resolution and keep the same physical dimensions (w/h in inches) for printing. I know the new pixel width/height needed based on the resolution values I'll pass in with <code>.SetResolution(xDpi,yDpi)</code> to preserve physical dimensions, so that's not the problem. The issue is things like the <code>PixelFormatSize</code> need to remain unchanged (yes, I've tried <code>EncoderParameters</code> - they don't work. I can give you the gory details if you like, but suffice it to say for now, they just don't work).</p> <p>Whew, got that off my chest! Okay, anyone who really knows how all this works can help?</p> <p><strong>EDIT</strong>: Files types needed to pull in to convert to PNG: BMP, TIF, GIF, WMF, EMF.</p>
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    1. USTodd Main
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    1. COReflector may be your friend here. You may be able to determine an exact combination of constructor and API that gives you what you want.
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      1. USMark Hurd
    2. COThanks Mark. I'm not familiar with Reflector, but I'll give that a look. Sounds potentially promising.
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      1. USTodd Main
 

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