Large DNG Files

[milner studios]

I create large Pano images and want to maintain the raw format for as long as possible in the editing process.  However I run into some errors from PTGui in creating them.  To avoid the 65000px limit I break the pano up into sections and then save those as DNG and them recombine them in photoshop as smart objects.  The issue arises with the cropping tool in PTGui.  As you move the yellow lines around, it causes the blending points of the frames to change their positions, and this causes alignment issues when re-constructing back in photoshop.  Now I understand I am probably not using this tool as intended, but is there or could there be a way to lock the blending lines so that any cropping performed does not change these blending line positions??

[John Mastrogiacomo]

I'm not by my computer now but I'm pretty sure you can save your pano as BigTif 16 bit to get around the size limit. Photoshop will import the BigTiff as one file. I doubt you will lose any visible quality vs. DNG.

On December 25, 2025 8:13:09 PM EST, milner studios <milner...@gmail.com> wrote:

I create large Pano images and want to maintain the raw format for as long as possible in the editing process.  However I run into some errors from PTGui in creating them.  To avoid the 65000px limit I break the pano up into sections and then save those as DNG and them recombine them in photoshop as smart objects.  The issue arises with the cropping tool in PTGui.  As you move the yellow lines around, it causes the blending points of the frames to change their positions, and this causes alignment issues when re-constructing back in photoshop.  Now I understand I am probably not using this tool as intended, but is there or could there be a way to lock the blending lines so that any cropping performed does not change these blending line positions??

John Mastrogiacomo

[PTGui Support]

Hi,

This doesn't work, the panorama must be blended as a whole. If you leave
out a section from the panorama, neighboring areas will be blended
differently.

I'm afraid I don't have a solution, other than switching to TIFF output.
The DNG format itself is capable of holding very large images but as far
as I know all readers can only handle 4GB files.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[milner studios]

thanks for the reply.  Is there programming options that could be considered to address this problem of oversize DNG that occur from pano stitching that are current unable to be opened by raw converters.  Eg. - option to manually crop image without changing how the pano is blended (creating image slices that align and can be rejoined in photoshop) or on exporting the pano, set a pixel dimension and have the software automatically create multiple files that can then be re-stitched but at least they will align.  Or if not the final option would be to complete all raw processing before PtGui and export out as a bigTiff.  Any consideration would be appreciated

mike