Lack of detail in Preview vs. GIMP using same image file.

Originally posted at usenet group: comp.graphics.apps.gimp
I am in the process of working on an image using GIMP's propietary
format, XCF. The image in question is approx. 6200x3200 px in size, at
a resolution of 72x72 dpi, RGB, True Color, 24-bit. The problem is
that when I export it to a more portable format, the image loses
clarity. I've uploaded an image to Photobucket demonstrating this.
This image consists of three windows, each displaying the same portion
of the piece I'm trying to export. The window top-left indicates the
original XCF format image at 100%, displaying in GIMP; the top-right
image is the same image at 100% exported to TIFF format (with no
compression), displaying in GIMP; the centre image is the latter TIFF
image, displayed in Preview.app, zoomed as close as possible to the
same degree as the GIMP images above - though in reality just a touch
larger, more like 110%. As is clear, the centre image is far less
detailed. <edit: I made this image forgetting that you can use "Use Actual Size" to view it. Nevertheless, when viewed at actual size the image is substantially smaller and less detailed.>
Could this be partly/altogether because i configured/calibrated
GIMP's display preferences to more accurately reflect my LCD screen's
resolution? in GIMP->Display Preferences, I manually set my monitor
resolution to 106x106dpi. However, the monitor resolution reported by
the windowing system, according to GIMP Display Prefs, is 75x75dpi.
I have tried saving as PNG without the resolution data, but the result is identical.
Can someone please explain this to me? Or, at the very least, suggest
a work-around? Is this, in actual fact, a problem with Preview.app or
my Quartz Extreme rendering?
I hope someone can help with this.
Thanks,
SiR G.

>I wish the developers could give us a switch to defeat this. PS displays, or at least hints at, sharpening when zoomed out.
They are quite set against it so I doubt it. Photoshop is really lying to you in many different ways when you judge sharpness at zoomed out levels. Of course, the only reason you see it in Photoshop is that it is a pixel editor. If you have rendered 1:1 previews, in Lightroom, you always see the effect of sharpening in the Library module when zoomed out as it is rendered from the preview image. In fact what you see there is the same when in Photoshop at power of two zoom levels (25%, 50%, etc.). So it is there, they just don't show it in Develop when you are zoomed out, where it would not tell you anything anyway.

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