Write a GIF
Write a magick-image object as a GIF file using the magick
package. This
function is a wrapper around image_write.
ee_utils_gif_save( image, path = NULL, format = NULL, quality = NULL, depth = NULL, density = NULL, comment = NULL, flatten = FALSE )
image |
magick image object returned by image_read. |
path |
path a file, url, or raster object or bitmap array. |
format |
output format such as |
quality |
number between 0 and 100 for jpeg quality. Defaults to 75. |
depth |
color depth (either 8 or 16). |
density |
resolution to render pdf or svg. |
comment |
text string added to the image metadata for supported formats. |
flatten |
should the image be flattened before writing? This also replaces transparency with a background color. |
No return value, called to write a GIF file.
Jeroen Ooms
Other GIF functions:
ee_utils_gif_annotate()
,
ee_utils_gif_creator()
## Not run: library(rgee) ee_Initialize() col <- ee$ImageCollection("JRC/GSW1_1/YearlyHistory")$map(function(img) { year <- img$date()$get("year") yearImg <- img$gte(2)$multiply(year) despeckle <- yearImg$connectedPixelCount(15, TRUE)$eq(15) yearImg$updateMask(despeckle)$selfMask()$set("year", year) }) appendReverse <- function(col) col$merge(col$sort('year', FALSE)) # ----------------------------------- # 1 Basic Animation - Ucayali Peru # ----------------------------------- bgColor = "FFFFFF" # Assign white to background pixels. riverColor = "0D0887" # Assign blue to river pixels. ## 1.1 Create the dataset annualCol = col$map(function(img) { img$unmask(0)$ visualize(min = 0, max = 1, palette = c(bgColor, riverColor))$ set("year", img$get("year")) }) basicAnimation <- appendReverse(annualCol) ## 1.2 Set video arguments aoi <- ee$Geometry$Rectangle(-74.327, -10.087, -73.931, -9.327) videoArgs = list( dimensions = 600, # Max dimension (pixels), min dimension is proportionally scaled. region = aoi, framesPerSecond = 10 ) ## 1.2 Download, display and save the GIF! animation <- ee_utils_gif_creator(basicAnimation, videoArgs, mode = "wb") get_years <- basicAnimation$aggregate_array("year")$getInfo() animation %>% ee_utils_gif_annotate("Ucayali, Peru") %>% ee_utils_gif_annotate(get_years, size = 15, location = "+90+40", boxcolor = "#FFFFFF") %>% ee_utils_gif_annotate("created using {magick} + {rgee}", size = 15, font = "sans",location = "+70+20") -> animation_wtxt gc(reset = TRUE) ee_utils_gif_save(animation_wtxt, path = paste0(tempfile(), ".gif")) ## End(Not run)
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