TIFF SHQ HQ Compared

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



I tried to make these images larger, but failed. Zooming them to
200% will help.

Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



I tried to make these images larger, but failed. Zooming them to
200% will help.

Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Russ Yost said:

Someone asked about development. I don't understand the question.
The images are what you would see if you magnified a 1/2 x 1/2 inch
region of a print of the original (out of the camera) 18.9 x 14.4
inch image. That image (for the E-100) would be 1360x1024 pixels,
ie, 72 pixels per inch, so a 1/2 x 1/2 inch crop would be 36 x 36
pixels. Your printer's pixels probably wouldn't be little uniformly
colored squares, but this representation gives you the color info
that each printed pixel would have.

I finally succeeded in making the crops larger so the pixels are
easier to see.
In the copy of previous message I changed the image reference so
give a look below:

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Click to expand...

Leo said:

Russ Yost said:

Someone asked about development. I don't understand the question.
The images are what you would see if you magnified a 1/2 x 1/2 inch
region of a print of the original (out of the camera) 18.9 x 14.4
inch image. That image (for the E-100) would be 1360x1024 pixels,
ie, 72 pixels per inch, so a 1/2 x 1/2 inch crop would be 36 x 36
pixels. Your printer's pixels probably wouldn't be little uniformly
colored squares, but this representation gives you the color info
that each printed pixel would have.

I finally succeeded in making the crops larger so the pixels are
easier to see.
In the copy of previous message I changed the image reference so
give a look below:

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Click to expand...

Click to expand...

Russ Yost said:

Color Mean StdDev
Red 192 40.3
Green 138 45.0
Blue 73.7 41.0

The values are from the colors' 8 bit ranges of 0 to 255. So it
was not actually a monochrome experiment. Actually, you can see
some brown piixels in the TIFF crop, and, you're right, the main
degradation in the HQ crop is in color "smearing". A single brown
pixel surrounded by greenish neighbors really gets clobbered!

The compression for this detailed image isn't severe: For the
whole scene images, the file sizes are 4.0 MB, 0.8 MB and 0.34 mb
respectively.

Leo said:

Russ Yost said:

Someone asked about development. I don't understand the question.
The images are what you would see if you magnified a 1/2 x 1/2 inch
region of a print of the original (out of the camera) 18.9 x 14.4
inch image. That image (for the E-100) would be 1360x1024 pixels,
ie, 72 pixels per inch, so a 1/2 x 1/2 inch crop would be 36 x 36
pixels. Your printer's pixels probably wouldn't be little uniformly
colored squares, but this representation gives you the color info
that each printed pixel would have.

I finally succeeded in making the crops larger so the pixels are
easier to see.
In the copy of previous message I changed the image reference so
give a look below:

Russ Yost said:

Here are results of shooting the same "scene" with TIFF, SHQ, and
HQ quality with an E-100, all set for 1360x1024 pixels. I cropped
a 1/2 inch square at the center of the resultant 14.44 x 18.88 inch
images, and set the pixels per inch at 72 so the individual pixels
would be clearly visible

Here's the original scene, chosen for lots of detail to "stress"
the JPEG compression. All were shot at F 7, 1/200 sec, for
optically sharp images. Lens was set at wide angle, 38 mm eq.
Auto spot focus was used.



Here are the 1/2 x 1/2 inch crops.



Note that pixels are not lost in the jpeg compressions; instead
some of the pixels' colors are distorted a bit by mixing with
neighboring pixels. Note also that SHQ is very close to TIFF!
--
Russell

Click to expand...

Click to expand...

Click to expand...

Click to expand...