  Within an imaging instrument's field of view, there may be many observational
targets of interest. Similarly, within a spectrograph's bandpass, there may be
many emission lines of interest. The brightness of these targets and lines can
be orders of magnitude different, which poses a challenge to instrument and
mission design. A single exposure can saturate the bright emission and/or have
a low signal to noise ratio (SNR) for faint emission. Traditional high dynamic
range (HDR) techniques solve this problem by either combining multiple
sequential exposures of varied duration or splitting the light to different
sensors. These methods, however, can result in the loss of science capability,
reduced observational efficiency, or increased complexity and cost. The
simultaneous HDR method described in this paper avoids these issues by
utilizing a special type of detector whose rows can be read independently to
define zones that are then composited, resulting in areas with short or long
exposure measured simultaneously. We demonstrate this technique for the sun,
which is bright on disk and faint off disk. We emulated these conditions in the
lab to validate the method. We built an instrument simulator to demonstrate the
method for a realistic solar imager and input. We then calculated SNRs, finding
a value of 45 for a faint coronal mass ejection (CME) and 200 for a bright CME,
both at 3.5 $R_{\odot}$ -- meeting or far exceeding the international standard
for digital photography that defines a SNR of 10 as acceptable and 40 as
excellent. Future missions should consider this type of hardware and technique
in their trade studies for instrument design.
