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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WSfd1234e1c4b69f30ea53e41001031ab64-78eba.html" title="Adjust dynamic range view for HDR images"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSAC4AF413-1584-4733-B2ED-8FB8FF67E8BDa.html" title="About the HDR Color Picker (Photoshop Extended)"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div class="hierarchy" id="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-794aa.html">Opening and importing images</a> /
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                <h1>
                    Convert from 32 bits to 8 or 16 bpc
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                <div><div class="section"><p>HDR
images contain luminance levels that far exceed the luminance data
that can be stored in 8‑ or 16‑bpc image files. You can make exposure
and contrast corrections when converting a 32‑bpc HDR image to 8
or 16 bpc to produce an image with the dynamic range (tonal range)
you want.</p>
</div>
<ol><li class="stepexpand"><span>Open a 32‑bpc image and choose Image&#160;&gt;
Mode&#160;&gt; 16 Bits/Channel or 8 Bits/Channel.</span></li>
<li class="stepexpand"><span>In the HDR Conversion dialog box, choose a method for
adjusting the brightness and contrast in the image:</span> <dl><dt class="dlterm">Exposure and Gamma</dt>
<dd>Lets you manually adjust the brightness and contrast
of the HDR image. </dd><p class="dlseparator"></p><dt class="dlterm">Highlight Compression</dt>
<dd>Compresses the highlight values in the HDR image so they
fall within the luminance values range of the 8‑ or 16‑bpc image
file. No further adjustments are necessary; this method is automatic.
Click&#160;OK to convert the 32‑bpc image.</dd><p class="dlseparator"></p><dt class="dlterm">Equalize Histogram</dt>
<dd>Compresses the dynamic range of the HDR image while trying
to preserve some contrast. No further adjustments are necessary;
this method is automatic. Click&#160;OK to convert the 32‑bpc
image.</dd><p class="dlseparator"></p><dt class="dlterm">Local Adaptation</dt>
<dd>Adjusts the tonality in the HDR image by calculating
the amount of correction necessary for local brightness regions
throughout the image. </dd><p class="dlseparator"></p></dl>
</li>
<li class="stepexpand"><span>(Optional) Click the arrow to display the toning curve
and histogram. The histogram shows the luminance values in the original
HDR image. The red tick marks along the horizontal axis are in 1
EV (approximately 1 f‑stop) increments. The toning curve is active
only for the Local Adaptation method. </span></li>
<li class="stepexpand"><span>Do any of the following: </span><ul><li><p>If you chose Exposure and Gamma, move the
Exposure slider to adjust the gain and move the Gamma slider to
adjust the contrast.</p>
</li>
<li><div class="para">If you chose Local Adaptation, move the Radius slider
to specify the size of the local brightness regions. Move the Threshold
slider to specify how far apart two pixels’ tonal values must be
before they’re no longer part of the same brightness region. You
can also use the Toning Curve and Histogram to make adjustments.<div class="note"><span class="notetitle">Note:  </span>The
Toning Curve and Histogram usually lets you make limited changes
from point to point and attempts to equalize your changes across
the points. If you select the Corner option after inserting a point
on the curve, the limit is removed and no equalization is performed
when you insert and move a second point. You’ll notice that the
curve becomes angular at a point with the Corner option applied.</div>
<div class="fignone"><img alt="" id="im_12" src="images/im_12.png" /><div class="figdesc">Toning Curve and Histogram adjustment using the Corner option</div><br /><dl><dt class="dlterm">A.</dt>
<dd>Inserting a point displays the Corner option.</dd><p class="dlseparator"></p><dt class="dlterm">B.</dt>
<dd>Adjusting
new point makes the curve angular at the point where the Corner
option is used.</dd><p class="dlseparator"></p></dl>
</div></div>
</li>
</ul>
</li>
<li class="stepexpand"><span>(Optional) To save your 32‑bit toning options as a file,
click Save. Type a name for the file in the Save dialog box and
click Save. </span> <p>You can reuse the saved 32‑bit toning option file. Click
Load to convert another 32‑bpc image to an 8‑ or 16‑bpc image.</p>
</li>
<li class="stepexpand"><span>Click OK to convert the 32‑bpc image.</span></li>
</ol>
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