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Rename CompressLevel to Quality for clarity

This commit is contained in:
Your Name 2022-02-01 10:41:50 -05:00
parent 03fa819716
commit 417a253ac7
2 changed files with 13 additions and 7 deletions
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12
README.md
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@ -4,16 +4,22 @@ imageoptimizer is a tool for bulk compression og JPG images. It will re-compress
more than the requested percentage difference, default is 25%. By defaul it operated in a "dry run" mode where images are not replaced more than the requested percentage difference, default is 25%. By defaul it operated in a "dry run" mode where images are not replaced
but individual and total savings are reported at the end, unless you supply the '-replace' flag. but individual and total savings are reported at the end, unless you supply the '-replace' flag.
# why?
Poorly optimized images in most contexts waste space and bandwidth unnecessarily. JPEG compression was designed to highly optimize photos with
little or no visually identifiable differences in default conditions, and for scenarios where absolute quality is less important it can compress
even farther. Generally quality levels below 75 are where you start to notice a difference.
# usage # usage
Recursively check all images starting from the current path. Calculate actions and total svings but don't make any changes. Recursively check all images starting from the current path. Calculate actions and total svings but don't make any changes.
``` ```
imageoptimizer -recursive -compresslevel 85 -diff 25 imageoptimizer -recursive -diff 25
``` ```
Replace images in the current path with a compressed version if compressing at 80% reduces file size by at least 30% Replace images in the current path with a compressed version if compressing at 80% quality reduces file size by at least 30%
``` ```
imageoptimizer -compresslevel --replace --diff 30 imageoptimizer -quality 80 --replace --diff 30
``` ```

8
main.go
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@ -13,7 +13,7 @@ import (
type config struct { type config struct {
Recursive bool Recursive bool
Diff uint Diff uint
CompressLevel uint Quality uint
Replace bool Replace bool
StartingPath string StartingPath string
Quiet bool Quiet bool
@ -31,7 +31,7 @@ func main() {
var c config var c config
flag.BoolVar(&c.Recursive, "recursive", false, "Process folders recursively (default false).") flag.BoolVar(&c.Recursive, "recursive", false, "Process folders recursively (default false).")
flag.UintVar(&c.Diff, "diff", 25, "Percent difference required to replace original image.") flag.UintVar(&c.Diff, "diff", 25, "Percent difference required to replace original image.")
flag.UintVar(&c.CompressLevel, "compresslevel", 85, "JPG compression level.") flag.UintVar(&c.Quality, "quality", 85, "JPG compression quality level.")
flag.BoolVar(&c.Quiet, "quiet", false, "Less output - don't print per-file detail") flag.BoolVar(&c.Quiet, "quiet", false, "Less output - don't print per-file detail")
flag.StringVar(&c.StartingPath, "startingpath", ".", "Start from this path instead of current working dir") flag.StringVar(&c.StartingPath, "startingpath", ".", "Start from this path instead of current working dir")
flag.BoolVar(&c.Replace, "replace", false, "Replace with compressed versions if criteria are met. Otheriwse, just test and report, don't replace any images. (default false)") flag.BoolVar(&c.Replace, "replace", false, "Replace with compressed versions if criteria are met. Otheriwse, just test and report, don't replace any images. (default false)")
@ -42,7 +42,7 @@ func main() {
fmt.Println("Fatal: diff out of range (-99)") fmt.Println("Fatal: diff out of range (-99)")
fail = true fail = true
} }
if c.CompressLevel > 99 { if c.Quality > 99 {
fmt.Println("Fatal: compresslevel out of range (1-99)") fmt.Println("Fatal: compresslevel out of range (1-99)")
fail = true fail = true
} }
@ -118,7 +118,7 @@ func doSingleImage(f string, c config, s stats) stats {
fmt.Printf("Couldn't open out temprary file: %s\n", err.Error()) fmt.Printf("Couldn't open out temprary file: %s\n", err.Error())
return s return s
} }
err = jpeg.Encode(out, orig, &jpeg.Options{Quality: int(c.CompressLevel)}) err = jpeg.Encode(out, orig, &jpeg.Options{Quality: int(c.Quality)})
if err != nil { if err != nil {
fmt.Printf("Error re-encoding image %s: %s\n", f, err.Error()) fmt.Printf("Error re-encoding image %s: %s\n", f, err.Error())
return s return s