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Layered image changes layer dimensions

Henry Wede

Hello,

I may be missing something but this seems very strange.  Several images were blended together using Sequator and the result was saved as a TIFF.  As expected, it has the same dimensions as the original raw files.  Now I select the TIFF image and a related CR2 file and open them as layers. 

The info panel correctly shows them as having the same dimensions, but they are different sizes.  If one of the layers is turned off a transparent border is shown indicating that it was smaller.  If I select the transform tool then it shows that the dimensions were changed.  

I tried to use the "Fit to canvas" button to scale the smaller image to the larger image but then in changes the aspect ratio ?!  I hope that the attached images explain the situation.

Why are the dimensions being changed?  If this is a bug, then how can I work around it?  This is completely stopping my weekend photo editing extravaganza :)

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3 comments

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  • Brian Lawson Community moderator

    The image on the bottom is slightly larger than the upper Layer's image. The size of the combined image reflects the size of the Canvas which was created to hold the bottom Layer. When you turn off that layer's visibility the checkered pattern you see around the top layer is the exposed Canvas.

    My guess is that when the images were stacked in Sequator they were trimmed slightly. What does ON1 show for the individual images' pixel dimensions? I'll bet Fence Star Trails - Sequator.tiff is just a bit smaller than the .cr2 file.

    How well do the images align without using the Fit To Canvas feature? Lower the Opacity of the upper Layer to compare them or change the Blending Mode of the top Layer to Difference. If the actual images are the same size you shouldn't see very much and all you need to do is crop the image to match the size of the smaller .tiff. If they are different try scaling one of them manually. I would probably scale down which ever is larger until they match in size, then Crop to clean it up.

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  • Henry Wede

    Actually, the bottom layer is larger but your logic is correct.

    Here is what I think I know:

    Windows shows the properties of the CR2 file as 6264 x 4180
    Affinity Photo shows the dimensions as 6264 x 4180
    Canon Digital Photo Professional software shows 6240 x 4160
    PhotoRaw shows 6240 x 4180
    The combined CR2 files in Sequator create a 6264 x 4180 file

    So there is obviously something strange going on but I don't know what.  Maybe some software trims the raw data and others don't?  There must be data out to 6264x4180, right?  But then why would both PR and Canon trim down to 6240x4160?  Or are the other programs scaling it up?  I have no idea what is going on. 

    Either somebody is trimming the data or somebody is scaling up the data.  That is a true statement, correct?

    I don't have Adobe programs or anything else to check the dimensions with.

    Thanks for your time,

    Henry

     

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  • Brian Lawson Community moderator

    I'm unsure where the scaling is coming from and in which direction it is being done. You'll have to ask support about that and the differences between the sizes reported by DPP & PR.

    My solution for fixing the problem still stands though. If both images are aligned and are the same size, not pixel dimensions — the actual images on the 2 layers align is what I'm referring to, then it's a simple matter to crop off the excess or you can merge the layers and clone in the missing edge. If the images have different sizes, scale one of them to match the other then merge and crop or clone.

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