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NO, tissue appears gray and bone appears white
No but they colaborate. Photoshop have more features but Lightroom have better cappabilities for photographers.
Yes, you can create animated GIF in Photoshop Elements. See related link for tutorial.
Yes you can, Photoshop 64 bit have exactly same options and tools as Photoshop 32 bit.
Adobe is the program owner while the photoshop is the program that runs on any computer it is loaded on, including iMac & MacBooks.
They mostly do the same things- but in Photoshop many actions can be done in a separate layer ... the end results may be the same, but in Photoshop you can go back and change things to a deeper level than you can in GIMP.
Use a computer. A program like Photoshop can be used to evaluate color. If a piece of the same paper is used as a control, and others are left in the sunlight, by scanning them in as .JPG files or .TIFF files and then opening them in Photoshop, they can be analyzed with the eyedropper tool and will report a hexadecimal number. Those numbers can be used in Photoshop directly to build a gradation scale or Excel to form an indexed chart.
Replacing and blending pixels at same time.
Not always. The color may vary on the color scheme but the category of the color remains the same. A black bear may appear gray. A brown bear may appear red or orange/yellow.
It is very easy to reprint a comic book cover in its original size. You can take measurements on a ruler and then use the scale available on programs like Adobe Photoshop to create a print in exact same size.
Photoshop Elements provides nearly the same functionality of the full version. It is neither easier nor more difficult to use.
Gray and grey are basically the same words, just that "gray" is the american derivation of "grey". So, both ways are acceptable and are the same wolf.