<div class="gmail_quote">On Mon, Jan 11, 2010 at 11:02 AM, Carnell, James E <span dir="ltr"><<a href="mailto:jecarnell@saintfrancis.com">jecarnell@saintfrancis.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<br><font size="2" face="Courier New">> I'm sure this is easy, but I am having a difficult time finding the </font>
<br><font size="2" face="Courier New">> right search terms to find it on the Internet. Any help much </font>
<br><font size="2" face="Courier New">> appreciated.</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> 3 dimensional array(x,y,rgb) which is a PIL image into a numpy array </font>
<br><font size="2" face="Courier New">> using 'asarray' function.</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> I want to subtract the Red Value in an array cell from a neighboring </font>
<br><font size="2" face="Courier New">> Red Value cell.</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> >>> pictArray[39][4] #pixel at 39 4</font>
<br><font size="2" face="Courier New">> array([150, 140, 120], dtype=unint8)</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> >>> pictArray[39][5] #pixel at 39 5</font>
<br><font size="2" face="Courier New">> array([160, 150, 120], dtype=unint8)</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> >>> pictArray[39][4][0] #red pixel</font>
<br><font size="2" face="Courier New">> 150</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> >>> pictArray[39][5[0] #neighboring red pixel</font>
<br><font size="2" face="Courier New">> 160</font>
<br><font size="2" face="Courier New">></font>
<br></div><div class="im"><font size="2" face="Courier New">> >>> pictArray[39][4][0] - pictArray[39][5][0]</font>
<br></div><div class="im"><font size="2" face="Courier New">> 246 # <--------------- ??? vs -10</font>
<br><font size="2" face="Courier New">></font>
<br><font size="2" face="Courier New">> How do I get the number -10? Does this have to do with the dtype?</font>
<br><font size="2" face="Courier New">></font>
</div><div class="im">
<p><font size="2" face="Courier New">It looks like you're re-typing from your terminal window into your Compose window... your life (and ours!) will be simpler if you just cut and paste. </font></p>
</div><p> <font size="2" face="Courier New">- sorry I am at work and due to security reasons can't plug a thumb drive in for copying copde from my laptop. I have corrected the values above. </font></p>
<p> <font size="2" face="Courier New">- pictArray[39][4][0] - pictArray[39][5][0] = 246 is where I am getting stuck</font>
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<br></blockquote><div>Silly of me not to have noticed, but those are UNsigned 8-bit integers, which means values 0-255. -10 wraps around to 246. <br><br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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