Ringkesan

Technical details

The image was produced by first scaling down the original picture in the GIMP and using ImageMagick convert to cut it into 8 pixel wide slices, which were each compressed at different quality levels using Perl and cjpeg and recombined with ImageMagick montage. The exact commands used were:

$ convert -crop 8x214 +adjoin Phalaenopsis_\(aka\).240x214.png Phalaenopsis_test_%02d.ppm
$ perl -e 'for $n (0..29) { system sprintf "cjpeg -optimize -sample 1x1 -dct float -quality %f Phalaenopsis_test_%02d.ppm
  >Phalaenopsis_test_%02d.jpg", 2+78*(1-$n/29)**2.3, $n, $n;}'
$ montage +frame +shadow +label -tile 30x1 -geometry 8x214+0+0 -quality 80 Phalaenopsis_test_??.jpg Phalaenopsis_JPEG.jpg

The expression 2+78*(1-$n/29)**2.3 produces a nonlinear quality gradient from 80% down to 2% quality. The exponent was chosen by trial and error to yield a nice looking image with a good balance of high and low quality areas.

Lisènsi

Kula, sing nduwèni hak cipta karya iki, mawa iki nerbitaké berkas iki sakisoré lisènsi kasebut:

Berkas ini dilisensikan di bawah lisensi Creative Commons Atribusi-Berbagi Serupa 2.5 Generik

Kowé kena:

• ngedum – nyalin, nyebar, lan ngirim karya
• nyampur – ngolah karya

Sangisoré kahanan mangkéné:

• atribusi – Kowé kudu mènèhi krédhit kang patut, mènèhi pranala lisènsi, lan kandha yèn ana owah-owahan. Kowé bisa tumindak sasenengmu, nanging ora teges kang duwé lisènsi njurung lakumu.
• andum mèmper – Manawa kowé nyalin rupa, ngowahi, utawa nggawé karya nganggo bahan karya iki, kowé kudu mbabar karyamu kang wis dadi nganggo lisènsi kang padha utawa kang cocog karo karya asliné..

https://creativecommons.org/licenses/by-sa/2.5CC BY-SA 2.5 Creative Commons Attribution-Share Alike 2.5 truetrue