Well, I just used BeyondCompare to compare the Steganographied graphic to the Non-Steganographied graphic to note the updates to the file. Sure enough, as to not currupt the original file, the new data is added to the end of the file, in fact it sits on the last line (well my 2 part message does, i can't validate this for files).

Original:
Code:
8Ҩ ii% Iھ|>~bA*?;
ˇ4 LZYU	R SbH$PCXϧ>SM5UMl<
n&#61696;6'媱V&#61708;tݝ;X0¸]z[
t*P5 1]8>٧t..R7FDM;?ԁL{qXb@[}
r9R)[/T?]omo1g#A%z=}BG$aփ\s9
ȴޮbLm&#61696;NA\LL%"IgX1Ig\
Y{;Ahdpm'Qv";9F_D=scLCh箆B
dE+NY+qh
New:
Code:
8Ҩ ii% Iھ|>~b&#61696;A*?;
ˇ4 LZYU	R SbH$PCXϧ>SM5UMl<
n&#61696;6'媱V&#61708;tݝ;X0¸]z[
t*P5 1]8>٧t..R7FDM;?ԁL{qXb@[}
r9R)[/T?]omo1g#A%z=}BG$aփ\s9
ȴޮbLm&#61696;NA\LL%"IgX1Ig\
Y{;Ahdpm'Qv";9F_D=scLCh箆B
dE+NY+qhٞ*&#61696;ɣp[䙸xr4
+N}1p9Buhqe&#61708;DI𵀩_/H?~1ͥ`=E2
],_9;jnF);-IU{&#61708;
}SsЀ5HjRcY:=v^|dv:D+&#61707;
FI͖mdT&qǕibA	T#lXh+h%@{ҽlb,
(tڽ <u0`=E2ܑ &#61696;Ok%{nŬV$KN;
HI&#61696;&#61696;&#61696;&#61696;810n>jkl<>:9l;?;&
#61696;&#61696;
So the updated is logically:
Code:
qhٞ*&#61696;ɣp[䙸xr4+N}1p
9Buhqe&#61708;DI𵀩_/H?~1ͥ`=E2],
_9;jnF);-IU{&#61708;}SsЀ5
HjRcY:=v^|dv:D+&#61707;FI͖m
dT&qǕibA	T#lXh+h%@{ҽlb,(tڽ <
u0`=E2ܑ &#61696;Ok%{nŬV$KN;HI&#6
1696;&#61696;&#61696;&#61696;810n>jkl<>:9l;?;&#61696;
&#61696;
Please note, I added the extra returns to clean up what will be displayed on the forums.

Also, my 2 line message only added 1k to the image file.
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