Too much white space above png figure after latex-dvi-pdf compilation

Question

I have searched the other question here extensively as the problem of spacing seems to re-occur often, but still have not found the solution to my specific problem:

I have way to much white space above my figure! Even after lowering the \floatsep (has no effect at all it seems). The figure itself does not have any white space on top (I have double checked). I have also tried by defining the bounding box instead of the natwidth,natheight, but still the same output so it is driving me crazy.

This is a MWE which results in the given picture which is of course not what I desire

\documentclass[fleqn,10pt,twoside,openright]{report}

\usepackage{graphicx}
% set graphics path
\graphicspath{{Figures/}}

\begin{document}

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\begin{figure}[htbp]%

\centering

\includegraphics[natwidth=124px,natheight=169px,width=5cm]{sad.png}%

\caption{testFig}%

\end{figure}

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\end{document}

Answer 1

I think this might be down to conflicting definitions of the size of a 'pixel'. Using preview, I find that this image has size 14pt x 14pt (approximately), or 48 pixels x 48 pixels.

However, the following experiment using pdftex produces something quite different:

*\newdimen\mydimen
*\mydimen=1px
*\showthe\mydimen
> 1.00375pt.

So 1px = 1pt (more or less). Using the image in a document, and compiling with latex+dvipdfmx produces white space if I use 48px for natwidth and natheight, but the problem goes away if I use 14pt.

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\fbox{\includegraphics[natwidth=48px,natheight=48px,width=5cm]{xboard.png}}% 
\fbox{\includegraphics[natwidth=14pt,natheight=14pt,width=5cm]{xboard.png}}% 
\end{document}

So, try using measurements in points, rather than pixels.

Answer 2

david carlisle, since you made the comment about the natwidth definition I started searching more in this direction and more specifically how I can avoid to use this. So I have found that if I include this, it works without needing to define the size of the image and the annoying white space disappears. Unfortunately, also my figure in my more complex document disappeared. But I figured out that was because I was also using the color package which was apparently interfering, but I solved that by putting the color package before the graphicx package and my figure re-appeared. Thank you for your help!

\usepackage[dvipdfm]{graphicx}
\usepackage{bmpsize}