badpixel.bin failed

c_joerg

1248

Re: badpixel.bin failed

« Reply #10 on: 03 / May / 2018, 15:31:14 »

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Quote from: 2frugal on 03 / May / 2018, 15:02:06

Here's what I did. In case it's easy, may be you can correct me?
dcraw -j -t 0 -4 330___05/CRW_1591.DNG

a1=imread('/mnt/win1/330___05/CRW_1591.ppm');
[iq,jq]=find(a1(:,:,1)==0 & a1(:,:,2)==0 & a1(:,:,3)==0);
size(iq)

If you only want to read RAW data (1 to 1) I do it in the following way:

Code: [Select]

dcraw -4 -D -T img_0001.dng
pic = imread(‘img_0001.tiff‘);

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2frugal

12

Re: badpixel.bin failed

« Reply #11 on: 03 / May / 2018, 15:46:05 »

Quote from: c_joerg on 03 / May / 2018, 15:31:14

Code: [Select]
dcraw -4 -D -T img_0001.dng

Thanks, the -D was the magic key!

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reyalp

14082

Re: badpixel.bin failed

« Reply #12 on: 03 / May / 2018, 17:18:20 »

Quote from: 2frugal on 03 / May / 2018, 15:46:05

Quote from: c_joerg on 03 / May / 2018, 15:31:14
Code: [Select]
dcraw -4 -D -T img_0001.dng
Thanks, the -D was the magic key!

FWIW, you can get this kind of information in chdkptp too, using the dnghist command:

Code: [Select]

___> dngload CRW_1591.DNG
loaded CRW_1591.DNG
___> dnghist -max=127 -bin=8
  0-  7 16193
  8- 15 0
 16- 23 0
 24- 31 0
 32- 39 0
 40- 47 0
 48- 55 0
 56- 63 0
 64- 71 0
 72- 79 0
 80- 87 0
 88- 95 0
 96-103 0
104-111 0
112-119 1
120-127 41
___> dngload CRW_1593.DNG
loaded CRW_1593.DNG
___> dnghist -max=127 -bin=8
  0-  7 54631
  8- 15 248
 16- 23 334
 24- 31 245
 32- 39 282
 40- 47 295
 48- 55 393
 56- 63 372
 64- 71 640
 72- 79 673
 80- 87 769
 88- 95 1104
 96-103 1332
104-111 1377
112-119 1797
120-127 2462

dngdump can be used to dump the data unmodified, e.g.

Code: [Select]

dngdump -raw -rfmt=16pgm

writes the data as a 16 bpp PGM file

edit: ~~Oops, forgot is shifted to fill the full 16 bit range, so not strictly unmodified.~~ Actually it doesn't, but it sets the maxval in in the pgm, which an image editing program may use to scale.

« Last Edit: 05 / May / 2018, 00:22:53 by reyalp »

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reyalp

14082

Re: badpixel.bin failed

« Reply #13 on: 03 / May / 2018, 17:42:22 »

Quote from: 2frugal on 03 / May / 2018, 12:45:45

Ok, let's see, 3 new DNGs. The CRW_1594.DNG is a bit underexposed, but hopefully still can be compared with the CRW_1593.DNG.

It looks to me like the ISO 3200 images always have 53543 zero valued pixels, but the numbers higher than 0 are variable.

This posses a dilemma for badpixel code, since the > 0 values will still look bad if unpatched, but can't be used to generate a list.

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Don't forget what the H stands for.

2frugal

12

Re: badpixel.bin failed

« Reply #14 on: 03 / May / 2018, 18:31:17 »

Quote from: reyalp on 03 / May / 2018, 17:42:22

the ISO 3200 images always have 53543 zero valued pixels, but the numbers higher than 0 are variable.

Yes, I'm confirming this (thanks for the dnghist!) for 6 other DNGs I have. I checked 0<=values<=15.

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