Example
Compressing an online jpg image:
library(resmush)
url <- paste0(
"https://raw.githubusercontent.com/dieghernan/",
"resmush/main/img/jpg_example_original.jpg"
)
resmush_url(url, outfile = "jpg_example_compress.jpg", overwrite = TRUE)
#> ══ resmush summary ════════════════════════════════════════════════════════════
#> ℹ Input: 1 url with size 178.7 Kb
#> ✔ Success for 1 url: Size now is 45 Kb (was 178.7 Kb). Saved 133.7 Kb (74.82%).
#> See result in directory '.'.
Original picture (top) 178.7 Kb and optimized picture (bottom) 45 Kb (Compression 74.8%)
The quality of the compression can be adjusted in the case of
jpg files using the parameter qlty. However,
it is recommended to keep this value above 90 to get a good image
quality.
# Extreme case
resmush_url(url,
outfile = "jpg_example_compress_low.jpg",
overwrite = TRUE, qlty = 3
)
#> ══ resmush summary ════════════════════════════════════════════════════════════
#> ℹ Input: 1 url with size 178.7 Kb
#> ✔ Success for 1 url: Size now is 2.2 Kb (was 178.7 Kb). Saved 176.4 Kb (98.74%).
#> See result in directory '.'.
Low quality image due to a high compression rate.
All the functions return invisibly a data set with a summary of the process. The next example shows how when compressing a local file.
png_file <- system.file("extimg/example.png", package = "resmush")
# For the example, copy to a temporary file
tmp_png <- tempfile(fileext = ".png")
file.copy(png_file, tmp_png, overwrite = TRUE)
#> [1] TRUE
summary <- resmush_file(tmp_png)
tibble::as_tibble(summary[, -c(1, 2)])
#> # A tibble: 1 × 6
#> src_size dest_size compress_ratio notes src_bytes dest_bytes
#> <chr> <chr> <chr> <chr> <dbl> <dbl>
#> 1 239.9 Kb 70.7 Kb 70.54% OK 245618 72356