This site is multilanguage:
Article published the
; modified the
6 minutes to read
This article has 1102 words.
RAW source of the article:
Commit version: e21600e
Description
The script helps you to convert easy and optimize images jpg/png.
Three options:
jpg2jpg: to optimize an image jpeg with a ratio to 70%.jpg2png: to convert an image jpg to an optimized image png. <span class"red">Be carefull: the weigth grows up!.png2png: to optimize an image png.
Please, install before using thoses tools:
mogrify, by the package ImageMagickjpegtran, by the librarie libjpegpngnqgvfs-info, by the package gvfs-bin
The script : convert_image()
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
#!/bin/bash
# ./convert_image /name_dir/ options
# options are: 'jpg2jpg', 'jpg2png', 'png2png'
# you need ImageMagick tools, libjpeg (jpegtran), gvfs-bin
# Convert image jpg
# 1/ jpg to jpg, quality 70 and optimize : option jpg2jpg
# 2/ jpg to png : option jp2png
# 3/ png to optimize png : option png2png
clear
# define variables needed
declare -a EXTS=( jpg JPG ) # extension accepted
declare -i ARGS=2 # number of arguments accepted declare -i mssg=1 #
to display message declare -i cmptr=0 # compteur declare -a
MIME[1]="image/jpeg" # mime type jpg declare -a
MIME[2]="image/png" # mime type png declare -a option=( jpg2jpg
jpg2png png2png )
IFS=$'n'
# functions needed !
function convert_image () {
verify_args $1 $2
verify_bin
create_vars_dir $1 $2
#empty_dir $dir_out
empty_dir $dir_out2
create_dir $dir_out
create_dir $dir_out2
for f in find $1 -type f;
do
create_vars_image
case $mime in
"${MIME[1]}")
case $2 in
"${option[0]}")
increment
jpg2jpg
optimize_jpg
empty_img_converted $dir_out $ff
;;
"${option[1]}")
increment
jpg2png
optimize_png
;;
*)
exit
;;
esac
;;
"${MIME[2]}")
case $2 in
"${option[2]}")
optimize_png
;;
*)
exit
;;
esac
;;
*)
exit
;;
esac
done
}
function create_dir () {
if [! -d $1](!_-d_$1); then
if (( mssg == 1 )); then echo "*** Create directory $1 ***"; fi
mkdir $1;
fi
}
function create_vars_dir () {
dir_out=$1"converted/"
if (( mssg == 1 )); then echo "*** Create variables needed for $2 : dir_out ***"; fi
dir_out2=$1"optim_jpg/"
if (( mssg == 1 )); then echo "*** Create variables needed for $2 : dir_out2 ***"; fi
}
function create_vars_image () {
dir=dirname $f
ff=basename $f
ext=${ff:(-3)};
name=basename $f .$ext
#length=${#ff}
#name=${ff:0:$length-4};
mime=gvfs-info --attributes="standard::content-type" $f | grep "standard::content-type" | cut -c27-
}
function empty_dir () {
if [ $1 ]; then
if [-d $1](-d_$1); then
cd $1
rm *
if (( mssg == 1 )); then echo "~~~ Dir $1 empty! ~~~"; fi
cd ..
fi
fi
}
function empty_img_converted () {
if [ $1 ]; then
if [-d $1](-d_$1); then
if [$2]($2); then
unlink $1$2;
if (( mssg == 1 )); then echo "=> 3/ Img $ff deleted in dir $1 !"; fi
fi
fi
fi
}
function increment () {
(( cptr++ ))
if (( mssg == 1 )); then echo "$cptr :: Image $ff { Mime Type: $mime } to convert"; fi
}
function jpg2jpg () {
cp $f $dir_out
cd $dir_out
if (( mssg == 1 )); then echo "=> 1/ Convert image $ff to quality 70 ..."; fi
mogrify -quality 70 $ff
cd ".."
}
function jpg2png () {
if (( mssg == 1 )); then echo "=> Convert image $ff to PNG ..."; fi
mogrify -format png $f
}
function optimize_jpg () {
if (( mssg == 1 )); then echo "=> 2/ Optimize image $ff with jpegtran ..."; fi
jpegtran -optimize -progressive -perfect -copy all $dir_out$ff > $dir_out2$ff
}
function optimize_png () {
if (( mssg == 1 )); then echo "=> Deplace image $name.png to optimize-it! ..."; fi
case $mime in
"${MIME[1]}")
mv $1$name".png" $dir_out
;;
"${MIME[2]}")
cp $1$name".png" $dir_out
;;
*)
exit
;;
esac
cd $dir_out
if (( mssg == 1 )); then echo "=> Optimize image $name.png with pngnq ..."; fi
pngnq -vf -s1 "$name.png"
if (( mssg == 1 )); then echo "=> delete $name.png ..."; fi
unlink "$name.png"
if (( mssg == 1 )); then echo "=> Rename image PNG temporary in name $name.png ..."; fi
mv "$name-nq8.png" "$name.png"
#echo "=> Optimize image PNG {$name.png} with optipng ..."
#optipng -o7 "$name.png"
cd ".."
}
function status () {
case $1 in
0) txt="*** More argument; just call the script as: ./convert_image /name_dir/ 'jpg2jpg|jpg2png|png2png' ***" ;;
1) txt="*** Directory needed! ***" ;;
2) txt="*** argument 'jpg2jpg', 'jpg2png' or 'png2png' needed! ***" ;;
3) txt="*** bad argument: argument is 'jpg2jpg', 'jpg2png' or 'png2png'! ***" ;;
4) txt="*** ERROR: Script stop here because the bin ***$2*** is not installed; in $3... ***" ;;
esac
if test -n "$txt"; then echo "$txt"; fi
exit
}
function verify_args () {
if test -z "$1"; then status 1; fi
if [! -d $1](!_-d_$1); then exit; fi
if test -z "$2"; then status 2; fi
if (( $2 != "jpg2jpg" || $2 != "jpg2png" || $2 != "png2png" )); then status 3; fi
}
function verify_bin () {
bin[1]="jpegtran"
bin[2]="mogrify"
bin[3]="gvfs-info"
get[1]="libjpeg"
get[2]="ImageMagick Tools"
get[3]="gvfs-bin"
for (( i=1 ; i<=3 ; i++ )) do
if [[ ! -e "/usr/bin/${bin[$i]}" ]]; then status 4 "${bin[$i]}" "${get[$i]}"; fi
done
}
# appel to the function convert_image
if [ $# -ne "$ARGS" ]; then
status 0
else
convert_image $1 $2
fi
|
Utilisation
Use as exemple:
$ chmod 0700 convert_image $ ./convert_image /name_dir/ option