# Tag Info

Accepted

### Why replicating the higher bits of RGB565 when converting to RGBA8888?

Without replicating the bits the LSBs will be 0, so for the maximum value of 0x1f (max for 5 bits) it would expand to 0xf8 when converted to 8 bit. What you want is 0xff so the range of 0x00->0x1f ...
• 2,322

### Why replicating the higher bits of RGB565 when converting to RGBA8888?

There's actually a reasonably good mathematical reason for doing bit replication: First note that the n-bit string, $N$, actually represents the value $\frac{N}{2^n-1}$ and we want to produce the m-...
• 4,296
Accepted

### Estimating real world object distance from photo

I may be misunderstanding what you're asking, but if you know the sensor size and the number of pixels in the object, then you can calculate the object size. For example, a Canon 7D has an APS-C ...
• 3,421

### Estimating real world object distance from photo

Yes, theoretically, for the sphere no for other things in image. If it is possible to augment the situation then it is possible to measure anything you can track much more reliably. First, knowing the ...
• 8,437
Accepted

### How do (Direct3D) precision conversions for floats work?

Rounding is all about what happens to the data in the higher precision format that don't exist in the lower precision one. For example, 0.7 cannot exactly be represented as an 8-bit unsigned, ...
• 9,842
1 vote
Accepted

### What are the exact math steps to convert sRGB (D65) to Lab (D50) colorspace?

convert sRGB to RGB by first removing gamma (colors must be in linear color space for the conversions to be accurate) The Fujiwaratko site is confusing since it lists sRGB in its table but the ...
• 3,229
1 vote

### Convert a .X mesh to a modern format

Perhaps Assimp will work for you? In particular, it has a command line tool for converting between formats.
• 237
1 vote

### Convert a .X mesh to a modern format

Blender appears to have a .X importer. It's a plugin that ships with Blender, but is disabled by default, so you have to enable it in User Preferences. See: https://blender.stackexchange.com/a/8749/...
• 369

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