Publisher Image on top affected by image underneath

[Chris26]

Windows 10.  AfPub 171.

Do not know why this happens.   When I place an image on top of another image, in this case seagulls on top of a lightly toned image, the top image acts like a window, the underneath layer affects the top layer.  I have done nothing to command this at all, theoretically I would never have expected this.  I used the Place CMD in both cases, no alterations have been made inside publisher.

First screen shot shows the iayer as it should be, the second when placed on top of another image. The change is most noticeable with the bird on the right.  In the past I have simply used an adjustment layer to bring back the colours, but I do not think I should have to do this.  The top image should never be affected by an image underneath unless one reduces opacity - as is standard practise.  Thankyou.  

       

[walt.farrell]

It would help to have a .zipped copy of your seagull image and the background image to experiment with.

However, lacking that, I will make a guess that your seagull image has some transparency. For example, at a minimum the areas around the seagulls that appear white must be transparent, or your background image could not show through on the composite on the right. And, presumably, the gulls themselves are at least partially transparent, unless you painted with 100% opacity at all times.

Anyplace that is less than 100% opaque will allow the background to show through, and therefore if the background is a different color than white the semi-transparent colors in the gulls will be affected.

 

[Chris26]

1 hour ago, walt.farrell said:

However, lacking that, I will make a guess that your seagull image has some transparency. For example, at a minimum the areas around the seagulls that appear white must be transparent, or your background image could not show through on the composite on the right. And, presumably, the gulls themselves are at least partially transparent, unless you painted with 100% opacity at all times.

Anyplace that is less than 100% opaque will allow the background to show through, and therefore if the background is a different color than white the semi-transparent colors in the gulls will be affected.

 

Yes Walt, , I went back to the original file to take another look, Logic states that this is what is happening, but I see nothing here that can promote this in publisher.  I will have to figure this one out since it certainly can not be Publisher's fault. I will download the original and replace and see what happens.

[Murfee]

I agree with Walt, if you had Photo this could easily be fixed without leaving Publisher 

[Chris26]

Hi Walt and Murfee,  Solved.  Completely missed the fact that I exported this image (due to its small size) as a PNG (24 colours only). All my images regardless in all documents are Tiffs.  But this one and only one is PNG.  The original is far more colourful  I really thought I had a problem with common sense, but now I realise it was simply - memory!.... not noticing the file extension.