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    <p>The basic problem here is one of scaling. More or less, figure out how much to expand the resolution of the image and then stretchdraw it to the printer canvas. Something like this gets the image stretched out to the dimension of the printer canvas.</p> <pre><code>procedure TForm1.Button2Click(Sender: TObject); var MyRect: TRect; scale: Double; begin if PrintDialog1.Execute then begin Printer.BeginDoc; scale := Printer.PageWidth / Bitmap1.Width; ShowMessage(FloatToStr(scale)); { horizontal pixels, vertical pixels, bit depth 600 x 600 x 24} MyRect.Left := 0; MyRect.Top := 0; MyRect.Right := trunc(Bitmap1.Width * scale); MyRect.Bottom := trunc(Bitmap1.Height * scale); Printer.Canvas.StretchDraw(MyRect, Bitmap1); Printer.EndDoc; end; </code></pre> <p>Of course, you have to check "Right" and "Bottom" to make sure they don't exceed your PageWidth and PageHeight depending on the type of scaling you use (6.25 or 600/96 seems fine for simply making an image the same relative size as the screen, assuming those numbers match your printer and screen), assuming you want to keep the image to one page and not mosaic pieces of it onto multiple pages.</p> <p>I don't know if this works entirely since I don't have a varied number of devices (i.e. different DPIs) to test both orientations on, but this seems to be what you want to get both DPI numbers dynamically.</p> <pre><code>if Printer.Orientation = poPortrait then scale := GetDeviceCaps(Printer.Handle, LOGPIXELSX) / PixelsPerInch else scale := GetDeviceCaps(Printer.Handle, LOGPIXELSY) / pixelsperinch; </code></pre> <p>Then of course, you multiply like above.</p>
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    1. POHow to print images on TPrinter in real size of image?
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    1. USGlenn1234
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    1. POHow to print images on TPrinter in real size of image?
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    1. COI don't use any dialogs. Only TPrinter in TThread.
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    2. COThanks for very useful info, my images (in the last column) exceed PageWidth, I don't know how to control it. Please, read 1st post again, for more info. I was changed it.
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    3. CO@Alexandr If you want to tile your image onto the page, you'd do like my first example for scale, but then divide by the number of images you want across the page (looks like 3 in your example). Then keep track of the proper position and paint the page accordingly. Also, your printer might not be able to print on the entire page (what Printer.Canvas represents) so you might need to allow for margins of some kind.
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