Build app with Xcode 4 - it always show some error about PNG image

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When I build my app with Xcode 4 it always show this error message:

CopyPNGFile /Users/michaelchen/Library/Developer/Xcode/DerivedData/iMusicBox-boeawugacmhacbdtyymnprzfobyq/ArchiveIntermediates/iMusicBox/InstallationBuildProductsLocation/Applications/iMusicBox.app/list_cell.png Images/list_cell.png
    cd /Volumes/WORK/Works/iMusicBox
    setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    "/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/PrivatePlugIns/iPhoneOS Build System Support.xcplugin/Contents/Resources/copypng" -compress "" /Volumes/WORK/Works/iMusicBox/Images/list_cell.png /Users/michaelchen/Library/Developer/Xcode/DerivedData/iMusicBox-boeawugacmhacbdtyymnprzfobyq/ArchiveIntermediates/iMusicBox/InstallationBuildProductsLocation/Applications/iMusicBox.app/list_cell.png

While checking alphas in /Volumes/WORK/Works/iMusicBox/Images/list_cell.png pngcrush caught libpng error: Not enough image data

but It's OK with Xcode 3.2 - why?

Lejeune answered 13/3, 2011 at 5:14 Comment(0)

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You have to save your PNG files as NOT INTERLACED. Try to open the file in photoshop (or similar), save as, and select "Not interlaced".

Claustral answered 15/3, 2011 at 11:46 Comment(4)

Eva, you're right, thanks! I export from web in pixelmator and it's OK. – Lejeune 15/3, 2011 at 16:6

man! thank God! and you! I was about to go to the rooftop to throw my stupid laptop from there when I saw this answer and it worked. Thanks a lot. I guess its time to sleep now. – Stool 20/7, 2012 at 20:18

In my case it turned out that I had several references to the same file in Xcode (this probably meant it tried to process the file more than once?) Removing the duplicate reference removed the problem. – Drama 16/11, 2012 at 14:24

I saved my png as NOT INTERLACED, still got this error when building first time, but the second time I build, this error gone... – Chrischrism 1/12, 2012 at 5:13

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That happens when you have multiple entries for the image file in your project file. I have no idea why but I just removed all entries, reloaded the project and added the file again.

Varied answered 6/9, 2012 at 7:54 Comment(2)

Hmm, are you sure you had the same compiler message from having doublettes? – Polyp 5/10, 2012 at 15:7

This was my problem too. My Launch Images where causing issues. By default, XCode had added black images in my Supporting Files folder, then I added more, but the black ones didn't go away. If the Launch image holder is black, that means there's an image in your project for it. Remove the black images and bring in your correct ones. Did that and now all is well again! – Encephalomyelitis 5/11, 2012 at 1:57

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Check that you don't have duplicate entries in the Target's "Build Phase"-> "Copy Bundle Resources"

Pylorectomy answered 24/6, 2013 at 18:24 Comment(1)

for anyone else who doesn't even have images in their project...this solution was the only one of all the answers that worked. I don't have images, but I am using the Facebook SDK and I had to delete anything that was red in Build Phases->Copy Bundle Resources. – Floruit 1/6, 2014 at 5:30

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It may be the "Compress PNG Files" setting (from the Packaging section of Build Settings).

I solved this error by switching it to "No".

Grantland answered 17/5, 2013 at 1:51 Comment(0)

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In my case I discovered my corrupted png wouldn't open in photoshop. I opened in preview, saved as psd, and then saved again from photoshop (save-as -> png -> not-interlaced). Compiles fine now in xcode 4.

Generally answered 11/4, 2011 at 22:25 Comment(0)

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Try to find and resave this *.PNG files using "Preview", to be exact: File - Export... - "save as PNG". It seems to me, that it happens when you saving image in Photoshop with mode "Save for Web" and after this image will be saved with special compressing (LZW). That's all, good luck!

Engadine answered 21/2, 2013 at 7:3 Comment(0)

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It looks like your PNG file list_cell.png is corrupt. Xcode 4 makes more checks than Xcode 3 in many areas and reveals problems that have been lurking in your project all the time.

Have you tried to open your PNG file in an image editor and save it again?

Appalachia answered 13/3, 2011 at 11:36 Comment(2)

Yes, I already open it in Preview, it's OK. and I try to save it again but the error still show. – Lejeune 13/3, 2011 at 14:30

Don't just open it in Preview. It might also try to work around the errors in the image. Open it with an application that can edit images and store a new version of the image. – Appalachia 13/3, 2011 at 14:36

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In my case I solved the problem by removing the blank "space-key" in folder/filename.

Hope this works for somebody too.

Circumgyration answered 5/9, 2012 at 6:46 Comment(0)

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Mine weren't interlaced but I kept getting odd errors from pngcrush. Eventually I deleted the files not just disk but through XCode. I added them back in one by one by drang-and-drop into XCode, building after each, expecting to hit one that had an issue. I never did. My conclusion is that you really need to manipulate the files from XCode and not the filesystem at all.

Sign answered 17/8, 2012 at 20:37 Comment(0)

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in my case with xcode 4.5 the problem is solved by permission giving with terminal

chmod -R +rw /yourprojectpath/yourprojectfolder

this is maybe not the best solution because of locking files with file sharing. But will do if you are in hurry.

Superable answered 24/9, 2012 at 8:57 Comment(0)

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I had to remove the references to PNGs and add them to the project again. Anyone has a better solution?

Hygienics answered 29/11, 2012 at 5:20 Comment(0)

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Follow the steps:

 1. Take an image. 

 2. Rename it to the showing error png's name. 

 3. Drag it back to the Xcode.

Nitrometer answered 8/11, 2012 at 5:36 Comment(1)

answer should me more descriptive – Adulterer 8/11, 2012 at 5:59

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I had to remove png files and then go to Targets -> AppName -> Build Phases -> Bundle Resources and remove the files from there too.

Synopsis answered 27/12, 2012 at 10:46 Comment(0)

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I got the same error. Turned out my pngs where actually jpeg. XCode showed them properly but an iOS device didn't. Solved it by saving the jpg as png.

Polychrome answered 29/3, 2013 at 15:7 Comment(0)

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This error happens because you have an image in resources that's smaller than 5 pixels in width or height and you are trying to resize that image. Set all images to minimum of 5 pixels and error disappears.

Shively answered 23/4, 2013 at 9:17 Comment(1)

This is what happened to me, this fixed it. – Expellee 11/2, 2014 at 13:33

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In my case, I had to remove all PNG files from the folder and then re-adding the files again without drag-and-dropping the images into the Xcode UI (under Launch Images). The latter was key in my case, first adding the files to the folder and then dragging them into the UI somehow cause a duplicate which screwed it all up. Try that out if nothing else's working for you.

Dreamland answered 30/12, 2012 at 2:58 Comment(0)

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I had the same problem. I resolved it removing the duplicate pictures. Check out in different folders. That was my problem.

Fillander answered 13/12, 2013 at 11:48 Comment(0)

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I solved this error, it's appear when you rename the images after put into the project, so for solve this problema first should delete the current images, rename files from finder and later copy this images into the project.

Downhill answered 17/12, 2013 at 4:7 Comment(0)

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May be help you. Check Alpha Channel property as shown in attached screenshot. It should be YES if its NO.

enter image description here

Cavite answered 17/12, 2013 at 10:0 Comment(0)

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May be help you. Check Alpha Channel property as shown in attached screenshot. It should be YES if its NO.

enter image description here

Cavite answered 17/12, 2013 at 10:4 Comment(0)

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Eva Madrazo posted the right answer (at least for problems with interlaced PNGs), but for those having this problem with a bunch of images as I did, you can use mogrify recursively to de-Interlace every file at once.

find ./ -name "*.png" -exec mogrify -interlace none {} \;

Changing the interlace method doesn't appear to affect the image quality, but affects the image size, none will give you a smaller image.

Mogrify comes with ImageMagick and you can install it with homebrew.

Bernice answered 17/1, 2014 at 15:30 Comment(0)

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Error:

While reading /Volumes/Mac OS/RDC/Workpot/RestApp/RestApp/default1024_768.png pngcrush caught libpng error: Not a PNG file..

Solution:

I have opened "default1024_768" file in PaintBrush tool and saveAs PNG file with same name.
Replaced the Icon file in Xcode project.
Clean --> Build

Homesteader answered 9/1, 2015 at 6:9 Comment(0)

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