#111 Column of blank pixels down right of QuickLook

[Matt Sephton]

I'm debugging QuickLook on macOS 14, wondering why it is not working during normal use pressing Space bar.

I can get previews if I do a command:

% qlmanage -p -c ataristste.image DOORS.PC1
Testing Quick Look preview with files:
DOORS.PC1

- force using content type UTI: ataristste.image

2025-08-27 17:32:45.517 qlmanage[17099:63558] +[IKImageContentView _clampImageAlphaTo01:colorSpace:] no CIImage passed in
2025-08-27 17:32:45.517 qlmanage[17099:63558] IKImageView2 _updateContentForLayerUsingIOSurface Error: source rect and destination rect of tile being drawn are not the same

The warning made me look at the preview and there is a column of black pixels down the right hand side. Could this be the size mismatch? Off by one error? I can reproduce in a .PC1 (attached) but not in your examples.

I'm still looking for why I can't QuickLook any files with RECOIL through pressing Space bar in Finder.

[Piotr Fusik]

DOORS.PC1 has one black column on the left and two black columns on the right.
PC1 is a simple format which is always 320x200.

[Piotr Fusik]

I'm still looking for why I can't QuickLook any files with RECOIL through pressing Space bar in Finder.

Some ideas:

1. qlmanage -r
2. qlmanage -r cache
3. Reboot
4. https://sourceforge.net/p/recoil/bugs/109/#573a

[Piotr Fusik]

Also: do you see RECOIL thumbnails but not the Space-activated preview?

[Matt Sephton]

I'll be more thorough with my testing in future!

Thanks the steps above, but no joy. even gatekeeper!

I can get RECOIL to work on macOS 12.7.6 (apart for image file extensions claimed by the system, IMG, PL5, PIC, SPX, OBJ, ODF, and more - see attached screenshot)

On macOS 14 I do not see either the thumbnails or the space-preview. I do see some errors in Console app, sadly redacted so not very useful. These are all lines from quicklook on DOORS.PC1

info    20:41:28.513459+0100    Finder  start loading item FIDSNode 0x600003B9FDE0 'D{7}1'  K:"Document" "//Users/m{2}t/Downloads/2{8}7/D{7}1"
info    20:41:28.519311+0100    Finder  created <private> (customView: (null))
info    20:41:28.519578+0100    Finder  start loading <private> with forced displayBundleID (null)
info    20:41:28.522927+0100    Finder  Getting <private> for 'Generator' from UTI '<private>' #UTI
info    20:41:28.523082+0100    Finder  Getting <private> for 'Generator' from UTI '<private>' #UTI
info    20:41:28.523509+0100    Finder  got displayBundleID com.apple.qldisplay.Generic for <private>
info    20:41:28.524099+0100    Finder  document <private> got display bundle <private>
info    20:41:28.524127+0100    Finder  previewView:<private> gotDisplayBundle:<private> forPreviewItem:<private>
info    20:41:28.524233+0100    Finder  Falling back on Generic preview for: <private>
info    20:41:28.525046+0100    Finder  Getting <private> for 'Generator' from UTI '<private>' #UTI
info    20:41:28.526305+0100    Finder  DID LOAD <private>
info    20:41:28.527486+0100    Finder  document <private> did load
info    20:41:28.527601+0100    Finder  setting displayable from <private> to <private>
info    20:41:28.532212+0100    Finder  previewView:<private> didShowPreviewItem:<private>
info    20:41:28.533871+0100    Finder  LSCopyDefaultApplicationURLForURL for <private> returned error Error Domain=NSOSStatusErrorDomain Code=-10814 UserInfo={_LSLine=1741, _LSFunction=<private>}
info    20:41:28.735683+0100    Finder  Getting <private> for 'Generator' from UTI '<private>' #UTI