image - How do I make java's ImageBuffer to read a PNG file correctly? -

-

for reason, opening png files using imagebuffer , imageio not work. here's code using works fine resizing/cropping jpgs:

bufferedimage image = imageio.read(new file(location));  bufferedimage croppedimage = image.getsubimage(     cropinfo.getx(), cropinfo.gety(), cropinfo.getw(), cropinfo.geth());  bufferedimage resizedimage = new bufferedimage(     target_width, target_height, croppedimage.gettype()); graphics2d g = resizedimage.creategraphics(); g.drawimage(croppedimage, 0, 0, target_width, target_height, null); g.dispose();  this.changecontenttype("image/png", ".png"); // not relevant. property  imageio.write(resizedimage, "png", new file(location));  return resizedimage;

the goal of function take whatever type given, resize , crop image, , save png same filename.

it works on windows, if crop/resize on linux (lenny), crashes altogether , complains type of file (it says type 0).

java.lang.illegalargumentexception: unknown image type 0     java.awt.image.bufferedimage.<init>(bufferedimage.java:490)     trainingdividend.domain.file.serverimage.resizeimage(serverimage.java:68)     trainingdividend.domain.file.serverimage.cropandresize(serverimage.java:80)     trainingdividend.service.user.useraccountmanagerimpl.cropavatar(useraccountmanagerimpl.java:155)     sun.reflect.nativemethodaccessorimpl.invoke0(native method)     sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)     sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)

solutions?

is there library can use altogether?

when running function on windows, croppedimaged.gettype() returns value 5. so, simple "hack" store type, check see if it's 0... , if is, set value 5 manually.

int imagetype = croppedimage.gettype(); if(imagetype == 0) imagetype = 5;

we pass in imagetype instead , should work on linux.

i sure has drawback if value 0 in other cases, set 5 , wrong. however, seems work common image types on linux , hasn't caused problems.

it's pretty clear windows version of java 1.6 fine, linux version has bug in it.


Comments

Post a Comment

Popular posts from this blog

objective c - Change font of selected text in UITextView -

-
can suggest me how change font of selected text in uitextview.i cannot use uiwebview since have edit text. have seen pages app.how possible in app. see formatting text within uilabel differently . since need editing, should @ javascript-based editors such ckeditor or tinymce . highly recommend wwdc 2011 video session 511: "rich text editing in safari on ios."
Read more

php - Accessing POST data in Facebook cavas app -

-
so i've got simple form in canvas / iframe facebook app, , i'm trying pass along values post. reading on s.o. , fb's latest docs, understand it, data send via post form can accessed on receiving end $_request object. i read on thread on s.o. in order post forms work need pass along input named "signed_request" value current signed_request (i have signed request working ok otherwise...all login , authentication stuff working fine). isnt mentioned anywhere in official fb docs. so problem comes in $_request object signed request, , bunch of other session stuff. form inputs found. the way can read them set method of form "request" isn't real form method. takes of inputs , sends them args in url. horrible. here's sample page canvas app form i'm using try debug (leaving out authentication stuff): <form enctype="application/x-www-form-urlencoded" method="post" target="_top" id="my_form" action=...
Read more

c# - Getting control value when switching a view as part of a multiview -

-
i have following code in aspx page: <asp:button id="display_button" runat="server" text="display" onclick="button1_click" /> &nbsp; <asp:button id="edit_button" runat="server" text="edit" onclick="button2_click" /> &nbsp; <asp:button id="save_button" runat="server" text="save" onclick="button3_click" visible="false" /> &nbsp; <asp:multiview id="multiview1" runat="server" activeviewindex="0"> <asp:view id="view1" runat="server"> <asp:formview id="view_program" runat="server"> <itemtemplate> <%# eval("status").tostring().trim() %> </itemtemplate> </asp:formview> </asp:view> <asp:view id="view2" runat="server"> ...
Read more