CR-TEKnologies

photo:hdr - created

cyril — Mon, 05 Mar 2012 12:18:33 +0200

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	+	====== HDR (High Dynamic Range) ======
	+
	+	===== Tips =====
	+
	+	* Standard way: 3 photos at -2,0,+2 EV. Very hard to realistically blend photos wider than 4 EV (automatic tools will either ignore extreme photos or produce unrealistic HDR photos).
	+
	+
	+	===== Tools =====
	+
	+	==== Hugin/enfuse ====
	+
	+	Does not work correctly with Hugin, better use directly enfuse.
	+
	+	If image were taken with a tripod and are already aligned, directly used enfuse:
	+	<code bash>
	+	#!/bin/bash
	+
	+	n_input=$#
	+	inputs=($*)
	+
	+	output=`echo ${inputs[0]} \| sed -r "s@(._[0-9]+)[^/]\\$@\1@"`-`echo ${inputs[$(($n_input-1))]} \| sed -r "s@._[0-9]+([0-9]{2})[^/]\\$@\1@"`.jpg
	+
	+	enfuse -o $output ${inputs[*]}
	+
	+	# fixme because hugin 2011.04 creates buggy jpg currently
	+	convert $output $output
	+	</code>
	+
	+	If you didn't use a tripod, or if the clouds are moving fast, align images before:
	+	<code bash>
	+	#!/bin/bash
	+
	+	n_input=$#
	+	inputs=($*)
	+
	+	output=`echo ${inputs[0]} \| sed -r "s@(._[0-9]+)[^/]\\$@\1@"`-`echo ${inputs[$(($n_input-1))]} \| sed -r "s@._[0-9]+([0-9]{2})[^/]\\$@\1@"`.jpg
	+	prefix=AHDR_`echo ${inputs[]} \| sed "s@[ ][^ ]*/@_@g"`_
	+
	+	align_image_stack -a /mnt/ram/${prefix} ${inputs[*]}
	+
	+	enfuse -o $output /mnt/ram/${prefix}*.tif
	+
	+	rm -f /mnt/ram/${prefix}*.tif
	+
	+	# fixme because hugin 2011.04 creates buggy jpg currently
	+	convert $output $output
	+	</code>
	+
	+
	+	==== LuminanceHDR/Qtpfsgui ====
	+
	+	* create new HDR
	+	* Choose profile ???
	+	* Choose operator:
	+	* mantiuk 06
	+	- adjust saturation and pre-gamma to get right color
	+	- adjust contrast and détails to get something realistic (less contrast and more details is more realistic)
	+	* adjust levels
	+
	+	==== Gimp ====
	+
	+	* open middle image, rename layer "middle"
	+	* open dark image, copy content, create layer "dark" in middle image, paste content, anchor
	+	* desaturate dark image, adjust curves (white is opaque), copy content, add layer mask in "dark" layer, paste content
	+	* open bright image, copy content, create layer "bright" in middle image, paste content, anchor
	+	* desaturate bright image, adjust curves (black is opaque), invert, copy content, add layer mask in "bright" layer, paste content
	+

software:gnuplot - [set]

cyril — Wed, 08 Feb 2012 17:40:43 +0200

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	set style histogram errorbars gap 0 lw 2		set style histogram errorbars gap 0 lw 2
	set style fill solid border -1		set style fill solid border -1
-	</gnuplot>	+	</code>

	* Clear window.<code gnuplot>		* Clear window.<code gnuplot>

programming:c-cpp-performance - [Vectorialization]

cyril — Tue, 17 Jan 2012 13:49:47 +0200

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	* SSE for float (<emmintrin.h>, operand type _ _mm128): _mm_add_ps, _mm_sub_ps, _mm_mul_ps, _mm_div_ps, _mm_sqrt_ps, _mm_rsqrt_ps, _mm_rcp_ps, _mm_load_ps, _mm_store_ps, _mm_set1_ps, _mm_setr_ps		* SSE for float (<emmintrin.h>, operand type _ _mm128): _mm_add_ps, _mm_sub_ps, _mm_mul_ps, _mm_div_ps, _mm_sqrt_ps, _mm_rsqrt_ps, _mm_rcp_ps, _mm_load_ps, _mm_store_ps, _mm_set1_ps, _mm_setr_ps
	* SSE2 for int (<xmmintrin.h>, operand type _ _mm128i): _mm_add_epi32, _mm_sub_epi32, _mm_set1_epi32, _mm_setr_epi32		* SSE2 for int (<xmmintrin.h>, operand type _ _mm128i): _mm_add_epi32, _mm_sub_epi32, _mm_set1_epi32, _mm_setr_epi32
-	* SSE2 int/float conversions: __builtin_ia32_cvtdq2ps, __builtin_ia32_cvtps2dq	+	* SSE2 int/float conversions: _ _builtin_ia32_cvtdq2ps, _ _builtin_ia32_cvtps2dq

	And you have to compile with GCC flags -msse and -msse2, or one -march that supports it.		And you have to compile with GCC flags -msse and -msse2, or one -march that supports it.

linux:commands

cyril — Mon, 16 Jan 2012 16:10:40 +0200

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-	====== Current Commands ======	+	====== Usual Commands ======

	===== Links =====		===== Links =====