wrote:

The Bobert wrote:

Open Image
Select Magic Wand
Click on a white area.
Under Special Menu choose Similar

Thanks. It worked, but it took some experimenting. My first experiments were in the Indexed Color mode. The magic wand always crashed the Photoshop. Then I tried Grayscale mode - it worked much better. I could select all the white pixels, but I could not remove them, so I selected all the black pixels and I pasted them into a new layer. This worked much better although I had to spend a minute aligning the pasted pixels with the rest of the image.
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ray wrote:

I don't understand - what are you going to replace
them with after you remove them?

I am trying to make a shading for a patent drawing. The U.S. patent office does not accept computer renderings of 3D CAD drawings. The drawings must have only two colors (black and white) and they must be either hand-made, or they must look like hand-made drawings. This means that the only way to make relatively nice 3D patent drawings is to combine 3 layers (lines, shading, text) in the Photoshop or a similar program. The two top layers must be transparent, so all the white pixels must be removed.

Ah, OK that's what you're doing, filling in colors on a monochrome bitmap. In photoshop the paintbucket might do what you need here... or not. For future reference, the better tool for this is something like Illustrator which can import the vector linework from ACAD & apply gradients & line weights, etc. Also it's going to look better with anti-aliased edges rather than jaggy forced bitmap edges. Zoom way in on some text in photoshop & you will see gray pixels softening the edges. Without those gray pixels it gets ugly.

Sir F. A. Rien wrote:

He/she/it just hasn't learned PS or know about pressing F1.

The Photoshop is very unstable, it lacks elementary features that one expects in a professional program, and its help file is a bad joke. I am used to AutoCAD, so I curse the Photoshop makers and I wonder why the professional computer programmers have not driven the Photoshop makers to the unemployment line.

Photoshop is hard to learn and the help files are indeed a cruel joke. Video tutorials are a nice way to go, or looking over someone's shoulder. Simply tinkering will not get you far. I picked it up gradually over about 15 years time working with people who know the tricks. ACAD I mostly taught myself, they are *very* different.

Crashing isn't normal: something else must be going on. If the file size is extremely large and/or too many undo levels are left in memory, that could bring things to a near standstill but PS almost never crashes in my experience.

mianileng

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How can I remove all white pixels?